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Question: 51  OF THE CAUSE OF HABITS, AS TO THEIR FORMATION (FOUR ARTICLES)

   We must next consider the cause of habits: and firstly, as to their formation; secondly, as to their increase; thirdly, as to their diminution and corruption. Under the first head there are four points of inquiry:

    (1) Whether any habit is from nature?

    (2) Whether any habit is caused by acts?

    (3) Whether any habit can be caused by one act?

    (4) Whether any habits are infused in man by God?
 
Article: 1

Whether any habit is from nature?

  Objection 1: It would seem that no habit is from nature. For the use of those things which are from nature does not depend on the will. But habit "is that which we use when we will," as the Commentator says on De Anima iii. Therefore habit is not from nature.

  Objection 2: Further, nature does not employ two where one is sufficient. But the powers of the soul are from nature. If therefore the habits of the powers were from nature, habit and power would be one.

  Objection 3: Further, nature does not fail in necessaries. But habits are necessary in order to act well, as we have stated above (Question [49], Article [4]). If therefore any habits were from nature, it seems that nature would not fail to cause all necessary habits: but this is clearly false. Therefore habits are not from nature.

  On the contrary, In Ethic. vi, 6, among other habits, place is given to understanding of first principles, which habit is from nature: wherefore also first principles are said to be known naturally.

  I answer that, One thing can be natural to another in two ways. First in respect of the specific nature, as the faculty of laughing is natural to man, and it is natural to fire to have an upward tendency. Secondly, in respect of the individual nature, as it is natural to Socrates or Plato to be prone to sickness or inclined to health, in accordance with their respective temperaments. Again, in respect of both natures, something may be called natural in two ways: first, because it entirely is from the nature; secondly, because it is partly from nature, and partly from an extrinsic principle. For instance, when a man is healed by himself, his health is entirely from nature; but when a man is healed by means of medicine, health is partly from nature, partly from an extrinsic principle.

   Thus, then, if we speak of habit as a disposition of the subject in relation to form or nature, it may be natural in either of the foregoing ways. For there is a certain natural disposition demanded by the human species, so that no man can be without it. And this disposition is natural in respect of the specific nature. But since such a disposition has a certain latitude, it happens that different grades of this disposition are becoming to different men in respect of the individual nature. And this disposition may be either entirely from nature, or partly from nature, and partly from an extrinsic principle, as we have said of those who are healed by means of art.

   But the habit which is a disposition to operation, and whose subject is a power of the soul, as stated above (Question [50], Article [2]), may be natural whether in respect of the specific nature or in respect of the individual nature: in respect of the specific nature, on the part of the soul itself, which, since it is the form of the body, is the specific principle; but in respect of the individual nature, on the part of the body, which is the material principle. Yet in neither way does it happen that there are natural habits in man, so that they be entirely from nature. In the angels, indeed, this does happen, since they have intelligible species naturally impressed on them, which cannot be said of the human soul, as we have said in the FP, Question [55], Article [2]; FP, Question [84], Article [3].

   There are, therefore, in man certain natural habits, owing their existence, partly to nature, and partly to some extrinsic principle: in one way, indeed, in the apprehensive powers; in another way, in the appetitive powers. For in the apprehensive powers there may be a natural habit by way of a beginning, both in respect of the specific nature, and in respect of the individual nature. This happens with regard to the specific nature, on the part of the soul itself: thus the understanding of first principles is called a natural habit. For it is owing to the very nature of the intellectual soul that man, having once grasped what is a whole and what is a part, should at once perceive that every whole is larger than its part: and in like manner with regard to other such principles. Yet what is a whole, and what is a part---this he cannot know except through the intelligible species which he has received from phantasms: and for this reason, the Philosopher at the end of the Posterior Analytics shows that knowledge of principles comes to us from the senses.

   But in respect of the individual nature, a habit of knowledge is natural as to its beginning, in so far as one man, from the disposition of his organs of sense, is more apt than another to understand well, since we need the sensitive powers for the operation of the intellect.

   In the appetitive powers, however, no habit is natural in its beginning, on the part of the soul itself, as to the substance of the habit; but only as to certain principles thereof, as, for instance, the principles of common law are called the "nurseries of virtue." The reason of this is because the inclination to its proper objects, which seems to be the beginning of a habit, does not belong to the habit, but rather to the very nature of the powers.

   But on the part of the body, in respect of the individual nature, there are some appetitive habits by way of natural beginnings. For some are disposed from their own bodily temperament to chastity or meekness or such like.

  Reply to Objection 1: This objection takes nature as divided against reason and will; whereas reason itself and will belong to the nature of man.

  Reply to Objection 2: Something may be added even naturally to the nature of a power, while it cannot belong to the power itself. For instance, with regard to the angels, it cannot belong to the intellective power itself capable of knowing all things: for thus it would have to be the act of all things, which belongs to God alone. Because that by which something is known, must needs be the actual likeness of the thing known: whence it would follow, if the power of the angel knew all things by itself, that it was the likeness and act of all things. Wherefore there must needs be added to the angels' intellective power, some intelligible species, which are likenesses of things understood: for it is by participation of the Divine wisdom and not by their own essence, that their intellect can be actually those things which they understand. And so it is clear that not everything belonging to a natural habit can belong to the power.

  Reply to Objection 3: Nature is not equally inclined to cause all the various kinds of habits: since some can be caused by nature, and some not, as we have said above. And so it does not follow that because some habits are natural, therefore all are natural.

Article: 2

Whether any habit is caused by acts?

  Objection 1: It would seem that no habit is caused by acts. For habit is a quality, as we have said above (Question [49], Article [1]). Now every quality is caused in a subject, according to the latter's receptivity. Since then the agent, inasmuch as it acts, does not receive but rather gives: it seems impossible for a habit to be caused in an agent by its own acts.

  Objection 2: Further, the thing wherein a quality is caused is moved to that quality, as may be clearly seen in that which is heated or cooled: whereas that which produces the act that causes the quality, moves, as may be seen in that which heats or cools. If therefore habits were caused in anything by its own act, it would follow that the same would be mover and moved, active and passive: which is impossible, as stated in Physics iii, 8.

  Objection 3: Further, the effect cannot be more noble than its cause. But habit is more noble than the act which precedes the habit; as is clear from the fact that the latter produces more noble acts. Therefore habit cannot be caused by an act which precedes the habit.

  On the contrary, The Philosopher (Ethic. ii, 1,2) teaches that habits of virtue and vice are caused by acts.

  I answer that, In the agent there is sometimes only the active principle of its act: for instance in fire there is only the active principle of heating. And in such an agent a habit cannot be caused by its own act: for which reason natural things cannot become accustomed or unaccustomed, as is stated in Ethic. ii, 1. But a certain agent is to be found, in which there is both the active and the passive principle of its act, as we see in human acts. For the acts of the appetitive power proceed from that same power according as it is moved by the apprehensive power presenting the object: and further, the intellective power, according as it reasons about conclusions, has, as it were, an active principle in a self-evident proposition. Wherefore by such acts habits can be caused in their agents; not indeed with regard to the first active principle, but with regard to that principle of the act, which principle is a mover moved. For everything that is passive and moved by another, is disposed by the action of the agent; wherefore if the acts be multiplied a certain quality is formed in the power which is passive and moved, which quality is called a habit: just as the habits of moral virtue are caused in the appetitive powers, according as they are moved by the reason, and as the habits of science are caused in the intellect, according as it is moved by first propositions.

  Reply to Objection 1: The agent, as agent, does not receive anything. But in so far as it moves through being moved by another, it receives something from that which moves it: and thus is a habit caused.

  Reply to Objection 2: The same thing, and in the same respect, cannot be mover and moved; but nothing prevents a thing from being moved by itself as to different respects, as is proved in Physics viii, text. 28,29.

  Reply to Objection 3: The act which precedes the habit, in so far as it comes from an active principle, proceeds from a more excellent principle than is the habit caused thereby: just as the reason is a more excellent principle than the habit of moral virtue produced in the appetitive power by repeated acts, and as the understanding of first principles is a more excellent principle than the science of conclusions.

Article: 3 

Whether a habit can be caused by one act?

  Objection 1: It would seem that a habit can be caused by one act. For demonstration is an act of reason. But science, which is the habit of one conclusion, is caused by one demonstration. Therefore habit can be caused by one act.

  Objection 2: Further, as acts happen to increase by multiplication so do they happen to increase by intensity. But a habit is caused by multiplication of acts. Therefore also if an act be very intense, it can be the generating cause of a habit.

  Objection 3: Further, health and sickness are habits. But it happens that a man is healed or becomes ill, by one act. Therefore one act can cause a habit.

  On the contrary, The Philosopher (Ethic. i, 7): "As neither does one swallow nor one day make spring: so neither does one day nor a short time make a man blessed and happy." But "happiness is an operation in respect of a habit of perfect virtue" (Ethic. i, 7,10,13). Therefore a habit of virtue, and for the same reason, other habits, is not caused by one act.

  I answer that, As we have said already (Article [2]), habit is caused by act, because a passive power is moved by an active principle. But in order that some quality be caused in that which is passive the active principle must entirely overcome the passive. Whence we see that because fire cannot at once overcome the combustible, it does not enkindle at once; but it gradually expels contrary dispositions, so that by overcoming it entirely, it may impress its likeness on it. Now it is clear that the active principle which is reason, cannot entirely overcome the appetitive power in one act: because the appetitive power is inclined variously, and to many things; while the reason judges in a single act, what should be willed in regard to various aspects and circumstances. Wherefore the appetitive power is not thereby entirely overcome, so as to be inclined like nature to the same thing, in the majority of cases; which inclination belongs to the habit of virtue. Therefore a habit of virtue cannot be caused by one act, but only by many.

   But in the apprehensive powers, we must observe that there are two passive principles: one is the "possible" [*See FP, Question [79], Article [2] ad 2] intellect itself; the other is the intellect which Aristotle (De Anima iii, text. 20) calls "passive," and is the "particular reason," that is the cogitative power, with memory and imagination. With regard then to the former passive principle, it is possible for a certain active principle to entirely overcome, by one act, the power of its passive principle: thus one self-evident proposition convinces the intellect, so that it gives a firm assent to the conclusion, but a probable proposition cannot do this. Wherefore a habit of opinion needs to be caused by many acts of the reason, even on the part of the "possible" intellect: whereas a habit of science can be caused by a single act of the reason, so far as the "possible" intellect is concerned. But with regard to the lower apprehensive powers, the same acts need to be repeated many times for anything to be firmly impressed on the memory. And so the Philosopher says (De Memor. et Remin. 1) that "meditation strengthens memory." Bodily habits, however, can be caused by one act, if the active principle is of great power: sometimes, for instance, a strong dose of medicine restores health at once.

   Hence the solutions to the objections are clear.
 
Article: 4 

Whether any habits are infused in man by God?

  Objection 1: It would seem that no habit is infused in man by God. For God treats all equally. If therefore He infuses habits into some, He would infuse them into all: which is clearly untrue.

  Objection 2: Further, God works in all things according to the mode which is suitable to their nature: for "it belongs to Divine providence to preserve nature," as Dionysius says (Div. Nom. iv). But habits are naturally caused in man by acts, as we have said above (Article [2]). Therefore God does not cause habits to be in man except by acts.

  Objection 3: Further, if any habit be infused into man by God, man can by that habit perform many acts. But "from those acts a like habit is caused" (Ethic. ii, 1,2). Consequently there will be two habits of the same species in the same man, one acquired, the other infused. Now this seems impossible: for the two forms of the same species cannot be in the same subject. Therefore a habit is not infused into man by God.

  On the contrary, it is written (Ecclus. 15:5): "God filled him with the spirit of wisdom and understanding." Now wisdom and understanding are habits. Therefore some habits are infused into man by God.

  I answer that, Some habits are infused by God into man, for two reasons.

   The first reason is because there are some habits by which man is disposed to an end which exceeds the proportion of human nature, namely, the ultimate and perfect happiness of man, as stated above (Question [5], Article [5]). And since habits need to be in proportion with that to which man is disposed by them, therefore is it necessary that those habits, which dispose to this end, exceed the proportion of human nature. Wherefore such habits can never be in man except by Divine infusion, as is the case with all gratuitous virtues.

   The other reason is, because God can produce the effects of second causes, without these second causes, as we have said in the FP, Question [105], Article [6]. Just as, therefore, sometimes, in order to show His power, He causes health, without its natural cause, but which nature could have caused, so also, at times, for the manifestation of His power, He infuses into man even those habits which can be caused by a natural power. Thus He gave to the apostles the science of the Scriptures and of all tongues, which men can acquire by study or by custom, but not so perfectly.

  Reply to Objection 1: God, in respect of His Nature, is the same to all, but in respect of the order of His Wisdom, for some fixed motive, gives certain things to some, which He does not give to others.

  Reply to Objection 2: That God works in all according to their mode, does not hinder God from doing what nature cannot do: but it follows from this that He does nothing contrary to that which is suitable to nature.

  Reply to Objection 3: Acts produced by an infused habit, do not cause a habit, but strengthen the already existing habit; just as the remedies of medicine given to a man who is naturally health, do not cause a kind of health, but give new strength to the health he had before.

Question: 52 OF THE INCREASE OF HABITS (THREE ARTICLES)

   We have now to consider the increase of habits; under which head there are three points of inquiry:

    (1) Whether habits increase?

    (2) Whether they increase by addition?

    (3) Whether each act increases the habit?
 
Article: 1 

Whether habits increase?

  Objection 1: It would seem that habits cannot increase. For increase concerns quantity (Phys. v, text. 18). But habits are not in the genus quantity, but in that of quality. Therefore there can be no increase of habits.

  Objection 2: Further, habit is a perfection (Phys. vii, text. 17,18). But since perfection conveys a notion of end and term, it seems that it cannot be more or less. Therefore a habit cannot increase.

  Objection 3: Further, those things which can be more or less are subject to alteration: for that which from being less hot becomes more hot, is said to be altered. But in habits there is no alteration, as is proved in Phys. vii, text. 15,17. Therefore habits cannot increase.

  On the contrary, Faith is a habit, and yet it increases: wherefore the disciples said to our Lord (Lk. 17:5): "Lord, increase our faith." Therefore habits increase.

  I answer that, Increase, like other things pertaining to quantity, is transferred from bodily quantities to intelligible spiritual things, on account of the natural connection of the intellect with corporeal things, which come under the imagination. Now in corporeal quantities, a thing is said to be great, according as it reaches the perfection of quantity due to it; wherefore a certain quantity is reputed great in man, which is not reputed great in an elephant. And so also in forms, we say a thing is great because it is perfect. And since good has the nature of perfection, therefore "in things which are great, but not in quantity, to be greater is the same as to be better," as Augustine says (De Trin. vi, 8).

   Now the perfection of a form may be considered in two ways: first, in respect of the form itself: secondly, in respect of the participation of the form by its subject. In so far as we consider the perfections of a form in respect of the form itself, thus the form is said to be "little" or "great": for instance great or little health or science. But in so far as we consider the perfection of a form in respect of the participation thereof by the subject, it is said to be "more" or "less": for instance more or less white or healthy. Now this distinction is not to be understood as implying that the form has a being outside its matter or subject, but that it is one thing to consider the form according to its specific nature, and another to consider it in respect of its participation by a subject.

   In this way, then, there were four opinions among philosophers concerning intensity and remission of habits and forms, as Simplicius relates in his Commentary on the Predicaments. For Plotinus and the other Platonists held that qualities and habits themselves were susceptible of more or less, for the reason that they were material and so had a certain want of definiteness, on account of the infinity of matter. Others, on the contrary, held that qualities and habits of themselves were not susceptible of more or less; but that the things affected by them [qualia] are said to be more or less, in respect of the participation of the subject: that, for instance, justice is not more or less, but the just thing. Aristotle alludes to this opinion in the Predicaments (Categor. vi). The third opinion was that of the Stoics, and lies between the two preceding opinions. For they held that some habits are of themselves susceptible of more and less, for instance, the arts; and that some are not, as the virtues. The fourth opinion was held by some who said that qualities and immaterial forms are not susceptible of more or less, but that material forms are.

   In order that the truth in this matter be made clear, we must observe that, in respect of which a thing receives its species, must be something fixed and stationary, and as it were indivisible: for whatever attains to that thing, is contained under the species, and whatever recedes from it more or less, belongs to another species, more or less perfect. Wherefore, the Philosopher says (Metaph. viii, text. 10) that species of things are like numbers, in which addition or subtraction changes the species. If, therefore, a form, or anything at all, receives its specific nature in respect of itself, or in respect of something belonging to it, it is necessary that, considered in itself, it be something of a definite nature, which can be neither more nor less. Such are heat, whiteness or other like qualities which are not denominated from a relation to something else: and much more so, substance, which is "per se" being. But those things which receive their species from something to which they are related, can be diversified, in respect of themselves, according to more or less: and nonetheless they remain in the same species, on account of the oneness of that to which they are related, and from which they receive their species. For example, movement is in itself more intense or more remiss: and yet it remains in the same species, on account of the oneness of the term by which it is specified. We may observe the same thing in health; for a body attains to the nature of health, according as it has a disposition suitable to an animal's nature, to which various dispositions may be suitable; which disposition is therefore variable as regards more or less, and withal the nature of health remains. Whence the Philosopher says (Ethic. x, 2,3): "Health itself may be more or less: for the measure is not the same in all, nor is it always the same in one individual; but down to a certain point it may decrease and still remain health."

   Now these various dispositions and measures of health are by way of excess and defect: wherefore if the name of health were given to the most perfect measure, then we should not speak of health as greater or less. Thus therefore it is clear how a quality or form may increase or decrease of itself, and how it cannot.

   But if we consider a quality or form in respect of its participation by the subject, thus again we find that some qualities and forms are susceptible of more or less, and some not. Now Simplicius assigns the cause of this diversity to the fact that substance in itself cannot be susceptible of more or less, because it is "per se" being. And therefore every form which is participated substantially by its subject, cannot vary in intensity and remission: wherefore in the genus of substance nothing is said to be more or less. And because quantity is nigh to substance, and because shape follows on quantity, therefore is it that neither in these can there be such a thing as more or less. Whence the Philosopher says (Phys. vii, text. 15) that when a thing receives form and shape, it is not said to be altered, but to be made. But other qualities which are further removed from quantity, and are connected with passions and actions, are susceptible of more or less, in respect of their participation by the subject.

   Now it is possible to explain yet further the reason of this diversity. For, as we have said, that from which a thing receives its species must remain indivisibly fixed and constant in something indivisible. Wherefore in two ways it may happen that a form cannot be participated more or less. First because the participator has its species in respect of that form. And for this reason no substantial form is participated more or less. Wherefore the Philosopher says (Metaph. viii, text. 10) that, "as a number cannot be more or less, so neither can that which is in the species of substance," that is, in respect of its participation of the specific form: "but in so far as substance may be with matter," i.e. in respect of material dispositions, "more or less are found in substance."

   Secondly this may happen from the fact that the form is essentially indivisible: wherefore if anything participate that form, it must needs participate it in respect of its indivisibility. For this reason we do not speak of the species of number as varying in respect of more or less; because each species thereof is constituted by an indivisible unity. The same is to be said of the species of continuous quantity, which are denominated from numbers, as two-cubits-long, three-cubits-long, and of relations of quantity, as double and treble, and of figures of quantity, as triangle and tetragon.

   This same explanation is given by Aristotle in the Predicaments (Categor. vi), where in explaining why figures are not susceptible of more or less, he says: "Things which are given the nature of a triangle or a circle, are accordingly triangles and circles": to wit, because indivisibility is essential to the motion of such, wherefore whatever participates their nature must participate it in its indivisibility.

   It is clear, therefore, since we speak of habits and dispositions in respect of a relation to something (Phys. vii, text. 17), that in two ways intensity and remission may be observed in habits and dispositions. First, in respect of the habit itself: thus, for instance, we speak of greater or less health; greater or less science, which extends to more or fewer things. Secondly, in respect of participation by the subject: in so far as equal science or health is participated more in one than in another, according to a diverse aptitude arising either from nature, or from custom. For habit and disposition do not give species to the subject: nor again do they essentially imply indivisibility.

   We shall say further on (Question [66], Article [1]) how it is with the virtues.

  Reply to Objection 1: As the word "great" is taken from corporeal quantities and applied to the intelligible perfections of forms; so also is the word "growth," the term of which is something great.

  Reply to Objection 2: Habit is indeed a perfection, but not a perfection which is the term of its subject; for instance, a term giving the subject its specific being. Nor again does the nature of a habit include the notion of term, as do the species of numbers. Wherefore there is nothing to hinder it from being susceptible of more or less.

  Reply to Objection 3: Alteration is primarily indeed in the qualities of the third species; but secondarily it may be in the qualities of the first species: for, supposing an alteration as to hot and cold, there follows in an animal an alteration as to health and sickness. In like manner, if an alteration take place in the passions of the sensitive appetite, or the sensitive powers of apprehension, an alteration follows as to science and virtue (Phys. viii, text. 20).

Article: 2 

Whether habits increases by addition?

  Objection 1: It would seem that the increase of habits is by way of addition. For the word "increase," as we have said, is transferred to forms, from corporeal quantities. But in corporeal quantities there is no increase without addition: wherefore (De Gener. i, text. 31) it is said that "increase is an addition to a magnitude already existing." Therefore in habits also there is no increase without addition.

  Objection 2: Further, habit is not increased except by means of some agent. But every agent does something in the passive subject: for instance, that which heats, causes heat in that which is heated. Therefore there is no increase without addition.

  Objection 3: Further, as that which is not white, is in potentiality to be white: so that which is less white, is in potentiality to be more white. But that which is not white, is not made white except by the addition of whiteness. Therefore that which is less white, is not made more white, except by an added whiteness.

  On the contrary, The Philosopher says (Phys. iv, text. 84): "That which is hot is made hotter, without making, in the matter, something hot, that was not hot, when the thing was less hot." Therefore, in like manner, neither is any addition made in other forms when they increase.

  I answer that, The solution of this question depends on what we have said above (Article [1]). For we said that increase and decrease in forms which are capable of intensity and remissness, happen in one way not on the part of the very form considered in itself, through the diverse participation thereof by the subject. Wherefore such increase of habits and other forms, is not caused by an addition of form to form; but by the subject participating more or less perfectly, one and the same form. And just as, by an agent which is in act, something is made actually hot, beginning, as it were, to participate a form, not as though the form itself were made, as is proved in Metaph. vii, text. 32, so, by an intense action of the agent, something is made more hot, as it were participating the form more perfectly, not as though something were added to the form.

   For if this increase in forms were understood to be by way of addition, this could only be either in the form itself or in the subject. If it be understood of the form itself, it has already been stated (Article [1]) that such an addition or subtraction would change the species; even as the species of color is changed when a thing from being pale becomes white. If, on the other hand, this addition be understood as applying to the subject, this could only be either because one part of the subject receives a form which it had not previously (thus we may say cold increases in a man who, after being cold in one part of his body, is cold in several parts), or because some other subject is added sharing in the same form (as when a hot thing is added to another, or one white thing to another). But in either of these two ways we have not a more white or a more hot thing, but a greater white or hot thing.

   Since, however, as stated above (Article [1]), certain accidents are of themselves susceptible of more or less, in some of these we may find increase by addition. For movement increases by an addition either to the time it lasts, or to the course it follows: and yet the species remains the same on account of the oneness of the term. Yet movement increases the intensity as to participation in its subject: i.e. in so far as the same movement can be executed more or less speedily or readily. In like manner, science can increase in itself by addition; thus when anyone learns several conclusions of geometry, the same specific habit of science increases in that man. Yet a man's science increases, as to the subject's participation thereof, in intensity, in so far as one man is quicker and readier than another in considering the same conclusions.

   As to bodily habits, it does not seem very probable that they receive increase by way of addition. For an animal is not said to be simply healthy or beautiful, unless it be such in all its parts. And if it be brought to a more perfect measure, this is the result of a change in the simple qualities, which are not susceptible of increase save in intensity on the part of the subject partaking of them.

   How this question affects virtues we shall state further on (Question [66], Article [1]).

  Reply to Objection 1: Even in bodily bulk increase is twofold. First, by addition of one subject to another; such is the increase of living things. Secondly, by mere intensity, without any addition at all; such is the case with things subject to rarefaction, as is stated in Phys. iv, text. 63.

  Reply to Objection 2: The cause that increases a habit, always effects something in the subject, but not a new form. But it causes the subject to partake more perfectly of a pre-existing form, or it makes the form to extend further.

  Reply to Objection 3: What is not already white, is potentially white, as not yet possessing the form of whiteness: hence the agent causes a new form in the subject. But that which is less hot or white, is not in potentiality to those forms, since it has them already actually: but it is in potentiality to a perfect mode of participation; and this it receives through the agent's action.

Article: 3 

Whether every act increases its habit?

  Objection 1: It would seem that every act increases its habit. For when the cause is increased the effect is increased. Now acts are causes of habits, as stated above (Question [51], Article [2]). Therefore a habit increases when its acts are multiplied.

  Objection 2: Further, of like things a like judgment should be formed. But all the acts proceeding from one and the same habit are alike (Ethic. ii, 1,2). Therefore if some acts increase a habit, every act should increase it.

  Objection 3: Further, like is increased by like. But any act is like the habit whence it proceeds. Therefore every act increases the habit.

  On the contrary, Opposite effects do not result from the same cause. But according to Ethic. ii, 2, some acts lessen the habit whence they proceed, for instance if they be done carelessly. Therefore it is not every act that increases a habit.

  I answer that, "Like acts cause like habits" (Ethic. ii, 1,2). Now things are like or unlike not only in respect of their qualities being the same or various, but also in respect of the same or a different mode of participation. For it is not only black that is unlike white, but also less white is unlike more white, since there is movement from less white to more white, even as from one opposite to another, as stated in Phys. v, text. 52.

   But since use of habits depends on the will, as was shown above (Question [50], Article [5]); just as one who has a habit may fail to use it or may act contrary to it; so may he happen to use the habit by performing an act that is not in proportion to the intensity of the habit. Accordingly, if the intensity of the act correspond in proportion to the intensity of the habit, or even surpass it, every such act either increases the habit or disposes to an increase thereof, if we may speak of the increase of habits as we do of the increase of an animal. For not every morsel of food actually increases the animal's size as neither does every drop of water hollow out the stone: but the multiplication of food results at last in an increase of the body. So, too, repeated acts cause a habit to grow. If, however, the act falls short of the intensity of the habit, such an act does not dispose to an increase of that habit, but rather to a lessening thereof.

   From this it is clear how to solve the objections.

Question: 53 HOW HABITS ARE CORRUPTED OR DIMINISHED (THREE ARTICLES)

   We must now consider how habits are lost or weakened; and under this head there are three points of inquiry:

    (1) Whether a habit can be corrupted?

    (2) Whether it can be diminished?

    (3) How are habits corrupted or diminished?
 
Article: 1 

Whether a habit can be corrupted?

  Objection 1: It would seem that a habit cannot be corrupted. For habit is within its subject like a second nature; wherefore it is pleasant to act from habit. Now so long as a thing is, its nature is not corrupted. Therefore neither can a habit be corrupted so long as its subject remains.

  Objection 2: Further, whenever a form is corrupted, this is due either to corruption of its subject, or to its contrary: thus sickness ceases through corruption of the animal, or through the advent of health. Now science, which is a habit, cannot be lost through corruption of its subject: since "the intellect," which is its subject, "is a substance that is incorruptible" (De Anima i, text. 65). In like manner, neither can it be lost through the action of its contrary: since intelligible species are not contrary to one another (Metaph. vii, text. 52). Therefore the habit of science can nowise be lost.

  Objection 3: Further, all corruption results from some movement. But the habit of science, which is in the soul, cannot be corrupted by a direct movement of the soul itself, since the soul is not moved directly. It is, however, moved indirectly through the movement of the body: and yet no bodily change seems capable of corrupting the intelligible species residing in the intellect: since the intellect independently of the body is the proper abode of the species; for which reason it is held that habits are not lost either through old age or through death. Therefore science cannot be corrupted. For the same reason neither can habits of virtue be corrupted, since they also are in the rational soul, and, as the Philosopher declares (Ethic. i, 10), "virtue is more lasting than learning."

  On the contrary, The Philosopher says (De Long. et Brev. Vitae ii) that "forgetfulness and deception are the corruption of science." Moreover, by sinning a man loses a habit of virtue: and again, virtues are engendered and corrupted by contrary acts (Ethic. ii, 2).

  I answer that, A form is said to be corrupted directly by its contrary; indirectly, through its subject being corrupted. When therefore a habit has a corruptible subject, and a cause that has a contrary, it can be corrupted both ways. This is clearly the case with bodily habits---for instance, health and sickness. But those habits that have an incorruptible subject, cannot be corrupted indirectly. There are, however, some habits which, while residing chiefly in an incorruptible subject, reside nevertheless secondarily in a corruptible subject; such is the habit of science which is chiefly indeed in the "possible" intellect, but secondarily in the sensitive powers of apprehension, as stated above (Question [50], Article [3], ad 3). Consequently the habit of science cannot be corrupted indirectly, on the part of the "possible" intellect, but only on the part of the lower sensitive powers.

   We must therefore inquire whether habits of this kind can be corrupted directly. If then there be a habit having a contrary, either on the part of itself or on the part of its cause, it can be corrupted directly: but if it has no contrary, it cannot be corrupted directly. Now it is evident that an intelligible species residing in the "possible" intellect, has no contrary; nor can the active intellect, which is the cause of that species, have a contrary. Wherefore if in the "possible" intellect there be a habit caused immediately by the active intellect, such a habit is incorruptible both directly and indirectly. Such are the habits of the first principles, both speculative and practical, which cannot be corrupted by any forgetfulness or deception whatever: even as the Philosopher says about prudence (Ethic. vi, 5) that "it cannot be lost by being forgotten." There is, however, in the "possible" intellect a habit caused by the reason, to wit, the habit of conclusions, which is called science, to the cause of which something may be contrary in two ways. First, on the part of those very propositions which are the starting point of the reason: for the assertion "Good is not good" is contrary to the assertion "Good is good" (Peri Herm. ii). Secondly, on the part of the process of reasoning; forasmuch as a sophistical syllogism is contrary to a dialectic or demonstrative syllogism. Wherefore it is clear that a false reason can corrupt the habit of a true opinion or even of science. Hence the Philosopher, as stated above, says that "deception is the corruption of science." As to virtues, some of them are intellectual, residing in reason itself, as stated in Ethic. vi, 1: and to these applies what we have said of science and opinion. Some, however, viz. the moral virtues, are in the appetitive part of the soul; and the same may be said of the contrary vices. Now the habits of the appetitive part are caused therein because it is natural to it to be moved by the reason. Therefore a habit either of virtue or of vice, may be corrupted by a judgment of reason, whenever its motion is contrary to such vice or virtue, whether through ignorance, passion or deliberate choice.

  Reply to Objection 1: As stated in Ethic. vii, 10, a habit is like a second nature, and yet it falls short of it. And so it is that while the nature of a thing cannot in any way be taken away from a thing, a habit is removed, though with difficulty.

  Reply to Objection 2: Although there is no contrary to intelligible species, yet there can be a contrary to assertions and to the process of reason, as stated above.

  Reply to Objection 3: Science is not taken away by movement of the body, if we consider the root itself of the habit, but only as it may prove an obstacle to the act of science; in so far as the intellect, in its act, has need of the sensitive powers, which are impeded by corporal transmutation. But the intellectual movement of the reason can corrupt the habit of science, even as regards the very root of the habit. In like manner a habit of virtue can be corrupted. Nevertheless when it is said that "virtue is more lasting than learning," this must be understood in respect, not of the subject or cause, but of the act: because the use of virtue continues through the whole of life, whereas the use of learning does not.

Article: 2 

Whether a habit can diminish?

  Objection 1: It would seem that a habit cannot diminish. Because a habit is a simple quality and form. Now a simple thing is possessed either wholly or not at all. Therefore although a habit can be lost it cannot diminish.

  Objection 2: Further, if a thing is befitting an accident, this is by reason either of the accident or of its subject. Now a habit does not become more or less intense by reason of itself; else it would follow that a species might be predicated of its individuals more or less. And if it can become less intense as to its participation by its subject, it would follow that something is accidental to a habit, proper thereto and not common to the habit and its subject. Now whenever a form has something proper to it besides its subject, that form can be separate, as stated in De Anima i, text. 13. Hence it follows that a habit is a separable form; which is impossible.

  Objection 3: Further, the very notion and nature of a habit as of any accident, is inherence in a subject: wherefore any accident is defined with reference to its subject. Therefore if a habit does not become more or less intense in itself, neither can it in its inherence in its subject: and consequently it will be nowise less intense.

  On the contrary, It is natural for contraries to be applicable to the same thing. Now increase and decrease are contraries. Since therefore a habit can increase, it seems that it can also diminish.

  I answer that, Habits diminish, just as they increase, in two ways, as we have already explained (Question [52], Article [1]). And since they increase through the same cause as that which engenders them, so too they diminish by the same cause as that which corrupts them: since the diminishing of a habit is the road which leads to its corruption, even as, on the other hand, the engendering of a habit is a foundation of its increase.

  Reply to Objection 1: A habit, considered in itself, is a simple form. It is not thus that it is subject to decrease; but according to the different ways in which its subject participates in it. This is due to the fact that the subject's potentiality is indeterminate, through its being able to participate a form in various ways, or to extend to a greater or a smaller number of things.

  Reply to Objection 2: This argument would hold, if the essence itself of a habit were nowise subject to decrease. This we do not say; but that a certain decrease in the essence of a habit has its origin, not in the habit, but in its subject.

  Reply to Objection 3: No matter how we take an accident, its very notion implies dependence on a subject, but in different ways. For if we take an accident in the abstract, it implies relation to a subject, which relation begins in the accident and terminates in the subject: for "whiteness is that whereby a thing is white." Accordingly in defining an accident in the abstract, we do not put the subject as though it were the first part of the definition, viz. the genus; but we give it the second place, which is that of the difference; thus we say that "simitas" is "a curvature of the nose." But if we take accidents in the concrete, the relation begins in the subject and terminates in the concrete, the relation begins in the subject and terminates at the accident: for "a white thing" is "something that has whiteness." Accordingly in defining this kind of accident, we place the subject as the genus, which is the first part of a definition; for we say that a "simum" is a "snub-nose." Accordingly whatever is befitting an accident on the part of the subject, but is not of the very essence of the accident, is ascribed to that accident, not in the abstract, but in the concrete. Such are increase and decrease in certain accidents: wherefore to be more or less white is not ascribed to whiteness but to a white thing. The same applies to habits and other qualities; save that certain habits and other qualities; save that certain habits increase or diminish by a kind of addition, as we have already clearly explained (Question [52], Article [2]).

Article: 3  

Whether a habit is corrupted or diminished through mere cessation from act?

  Objection 1: It would seem that a habit is not corrupted or diminished through mere cessation from act. For habits are more lasting than passion-like qualities, as we have explained above (Question [49], Article [2], ad 3; Question [50], Article [1]). But passion-like qualities are neither corrupted nor diminished by cessation from act: for whiteness is not lessened through not affecting the sight, nor heat through ceasing to make something hot. Therefore neither are habits diminished or corrupted through cessation from act.

  Objection 2: Further, corruption and diminution are changes. Now nothing is changed without a moving cause. Since therefore cessation from act does not imply a moving cause, it does not appear how a habit can be diminished or corrupted through cessation from act.

  Objection 3: Further, the habits of science and virtue are in the intellectual soul which is above time. Now those things that are above time are neither destroyed nor diminished by length of time. Neither, therefore, are such habits destroyed or diminished through length of time, if one fails for long to exercise them.

  On the contrary, The Philosopher says (De Long. et Brev. Vitae ii) that not only "deception," but also "forgetfulness, is the corruption of science." Moreover he says (Ethic. viii, 5) that "want of intercourse has dissolved many a friendship." In like manner other habits of virtue are diminished or destroyed through cessation from act.

  I answer that, As stated in Phys. vii, text. 27, a thing is a cause of movement in two ways. First, directly; and such a thing causes movement by reason of its proper form; thus fire causes heat. Secondly, indirectly; for instance, that which removes an obstacle. It is in this latter way that the destruction or diminution of a habit results through cessation from act, in so far, to wit, as we cease from exercising an act which overcame the causes that destroyed or weakened that habit. For it has been stated (Article [1]) that habits are destroyed or diminished directly through some contrary agency. Consequently all habits that are gradually undermined by contrary agencies which need to be counteracted by acts proceeding from those habits, are diminished or even destroyed altogether by long cessation from act, as is clearly seen in the case both of science and of virtue. For it is evident that a habit of moral virtue makes a man ready to choose the mean in deeds and passions. And when a man fails to make use of his virtuous habit in order to moderate his own passions or deeds, the necessary result is that many passions and deeds fail to observe the mode of virtue, by reason of the inclination of the sensitive appetite and of other external agencies. Wherefore virtue is destroyed or lessened through cessation from act. The same applies to the intellectual habits, which render man ready to judge aright of those things that are pictured by his imagination. Hence when man ceases to make use of his intellectual habits, strange fancies, sometimes in opposition to them, arise in his imagination; so that unless those fancies be, as it were, cut off or kept back by frequent use of his intellectual habits, man becomes less fit to judge aright, and sometimes is even wholly disposed to the contrary, and thus the intellectual habit is diminished or even wholly destroyed by cessation from act.

  Reply to Objection 1: Even heat would be destroyed through ceasing to give heat, if, for this same reason, cold which is destructive of heat were to increase.

  Reply to Objection 2: Cessation from act is a moving cause, conducive of corruption or diminution, by removing the obstacles, thereto, as explained above.

  Reply to Objection 3: The intellectual part of the soul, considered in itself, is above time, but the sensitive part is subject to time, and therefore in course of time it undergoes change as to the passions of the sensitive part, and also as to the powers of apprehension. Hence the Philosopher says (Phys. iv. text. 117) that time makes us forget.

Question: 54 OF THE DISTINCTION OF HABITS (FOUR ARTICLES)

   We have now to consider the distinction of habits; and under this head there are four points of inquiry:

    (1) Whether many habits can be in one power?

    (2) Whether habits are distinguished by their objects?

    (3) Whether habits are divided into good and bad?

    (4) Whether one habit may be made up of many habits?
 
Article: 1 

Whether many habits can be in one power?

  Objection 1: It would seem that there cannot be many habits in one power. For when several things are distinguished in respect of the same thing, if one of them be multiplied, the others are too. Now habits and powers are distinguished in respect of the same thing, viz. their acts and objects. Therefore they are multiplied in like manner. Therefore there cannot be many habits in one power.

  Objection 2: Further, a power is a simple force. Now in one simple subject there cannot be diversity of accidents; for the subject is the cause of its accidents; and it does not appear how diverse effects can proceed from one simple cause. Therefore there cannot be many habits in one power.

  Objection 3: Further, just as the body is informed by its shape, so is a power informed by a habit. But one body cannot be informed at the same time by various shapes. Therefore neither can a power be informed at the same time by many habits. Therefore several habits cannot be at the same time in one power.

  On the contrary, The intellect is one power; wherein, nevertheless, are the habits of various sciences.

  I answer that, As stated above (Question [49], Article [4]), habits are dispositions of a thing that is in potentiality to something, either to nature, or to operation, which is the end of nature. As to those habits which are dispositions to nature, it is clear that several can be in one same subject: since in one subject we may take parts in various ways, according to the various dispositions of which parts there are various habits. Thus, if we take the humors as being parts of the human body, according to their disposition in respect of human nature, we have the habit or disposition of health: while, if we take like parts, such as nerves, bones, and flesh, the disposition of these in respect of nature is strength or weakness; whereas, if we take the limbs, i.e. the hands, feet, and so on, the disposition of these in proportion to nature, is beauty: and thus there are several habits or dispositions in the same subject.

   If, however, we speak of those habits that are dispositions to operation, and belong properly to the powers; thus, again, there may be several habits in one power. The reason for this is that the subject of a habit is a passive power, as stated above (Question [51], Article [2]): for it is only an active power that cannot be the subject of a habit, as was clearly shown above (Question [51], Article [2]). Now a passive power is compared to the determinate act of any species, as matter to form: because, just as matter is determinate to one form by one agent, so, too, is a passive power determined by the nature of one active object to an act specifically one. Wherefore, just as several objects can move one passive power, so can one passive power be the subject of several acts or perfections specifically diverse. Now habits are qualities or forms adhering to a power, and inclining that power to acts of a determinate species. Consequently several habits, even as several specifically different acts, can belong to one power.

  Reply to Objection 1: Even as in natural things, diversity of species is according to the form, and diversity of genus, according to matter, as stated in Metaph. v, text. 33 (since things that differ in matter belong to different genera): so, too, generic diversity of objects entails a difference of powers (wherefore the Philosopher says in Ethic. vi, 1, that "those objects that differ generically belong to different departments of the soul"); while specific difference of objects entails a specific difference of acts, and consequently of habits also. Now things that differ in genus differ in species, but not vice versa. Wherefore the acts and habits of different powers differ in species: but it does not follow that different habits are in different powers, for several can be in one power. And even as several genera may be included in one genus, and several species be contained in one species; so does it happen that there are several species of habits and powers.

  Reply to Objection 2: Although a power is simple as to its essence, it is multiple virtually, inasmuch as it extends to many specifically different acts. Consequently there is nothing to prevent many superficially different habits from being in one power.

  Reply to Objection 3: A body is informed by its shape as by its own terminal boundaries: whereas a habit is not the terminal boundary of a power, but the disposition of a power to an act as to its ultimate term. Consequently one same power cannot have several acts at the same time, except in so far as perchance one act is comprised in another; just as neither can a body have several shapes, save in so far as one shape enters into another, as a three-sided in a four-sided figure. For the intellect cannot understand several things at the same time "actually"; and yet it can know several things at the same time "habitually."

Article: 2  

Whether habits are distinguished by their objects?

  Objection 1: It would seem that habits are not distinguished by their objects. For contraries differ in species. Now the same habit of science regards contraries: thus medicine regards the healthy and the unhealthy. Therefore habits are not distinguished by objects specifically distinct.

  Objection 2: Further, different sciences are different habits. But the same scientific truth belongs to different sciences: thus both the physicist and the astronomer prove the earth to be round, as stated in Phys. ii, text. 17. Therefore habits are not distinguished by their objects.

  Objection 3: Further, wherever the act is the same, the object is the same. But the same act can belong to different habits of virtue, if it be directed to different ends; thus to give money to anyone, if it be done for God's sake, is an act of charity; while, if it be done in order to pay a debt, it is an act of justice. Therefore the same object can also belong to different habits. Therefore diversity of habits does not follow diversity of objects.

  On the contrary, Acts differ in species according to the diversity of their objects, as stated above (Question [18], Article [5]). But habits are dispositions to acts. Therefore habits also are distinguished according to the diversity of objects.

  I answer that, A habit is both a form and a habit. Hence the specific distinction of habits may be taken in the ordinary way in which forms differ specifically; or according to that mode of distinction which is proper to habits. Accordingly forms are distinguished from one another in reference to the diversity of their active principles, since every agent produces its like in species. Habits, however, imply order to something: and all things that imply order to something, are distinguished according to the distinction of the things to which they are ordained. Now a habit is a disposition implying a twofold order: viz. to nature and to an operation consequent to nature.

   Accordingly habits are specifically distinct in respect of three things. First, in respect of the active principles of such dispositions; secondly, in respect of nature; thirdly, in respect of specifically different objects, as will appear from what follows.

  Reply to Objection 1: In distinguishing powers, or also habits, we must consider the object not in its material but in its formal aspect, which may differ in species or even in genus. And though the distinction between specific contraries is a real distinction yet they are both known under one aspect, since one is known through the other. And consequently in so far as they concur in the one aspect of cognoscibility, they belong to one cognitive habit.

  Reply to Objection 2: The physicist proves the earth to be round by one means, the astronomer by another: for the latter proves this by means of mathematics, e.g. by the shapes of eclipses, or something of the sort; while the former proves it by means of physics, e.g. by the movement of heavy bodies towards the center, and so forth. Now the whole force of a demonstration, which is "a syllogism producing science," as stated in Poster. i, text. 5, depends on the mean. And consequently various means are as so many active principles, in respect of which the habits of science are distinguished.

  Reply to Objection 3: As the Philosopher says (Phys. ii, text. 89; Ethic. vii, 8), the end is, in practical matters, what the principle is in speculative matters. Consequently diversity of ends demands a diversity of virtues, even as diversity of active principles does. Moreover the ends are objects of the internal acts, with which, above all, the virtues are concerned, as is evident from what has been said (Question [18], Article [6]; Question [19], Article [2], ad 1; Question [34], Article [4]).
 
Article: 3 

Whether habits are divided into good and bad?

  Objection 1: It would seem that habits are not divided into good and bad. For good and bad are contraries. Now the same habit regards contraries, as was stated above (Article [2], Objection [1]). Therefore habits are not divided into good and bad.

  Objection 2: Further, good is convertible with being; so that, since it is common to all, it cannot be accounted a specific difference, as the Philosopher declares (Topic. iv). Again, evil, since it is a privation and a non-being, cannot differentiate any being. Therefore habits cannot be specifically divided into good and evil.

  Objection 3: Further, there can be different evil habits about one same object; for instance, intemperance and insensibility about matters of concupiscence: and in like manner there can be several good habits; for instance, human virtue and heroic or godlike virtue, as the Philosopher clearly states (Ethic. vii, 1). Therefore, habits are not divided into good and bad.

  On the contrary, A good habit is contrary to a bad habit, as virtue to vice. Now contraries are divided specifically into good and bad habits.

  I answer that, As stated above (Article [2]), habits are specifically distinct not only in respect of their objects and active principles, but also in their relation to nature. Now, this happens in two ways. First, by reason of their suitableness or unsuitableness to nature. In this way a good habit is specifically distinct from a bad habit: since a good habit is one which disposes to an act suitable to the agent's nature, while an evil habit is one which disposes to an act unsuitable to nature. Thus, acts of virtue are suitable to human nature, since they are according to reason, whereas acts of vice are discordant from human nature, since they are against reason. Hence it is clear that habits are distinguished specifically by the difference of good and bad.

   Secondly, habits are distinguished in relation to nature, from the fact that one habit disposes to an act that is suitable to a lower nature, while another habit disposes to an act befitting a higher nature. And thus human virtue, which disposes to an act befitting human nature, is distinct from godlike or heroic virtue, which disposes to an act befitting some higher nature.

  Reply to Objection 1: The same habit may be about contraries in so far as contraries agree in one common aspect. Never, however, does it happen that contrary habits are in one species: since contrariety of habits follows contrariety of aspect. Accordingly habits are divided into good and bad, namely, inasmuch as one habit is good, and another bad; but not by reason of one habit being something good, and another about something bad.

  Reply to Objection 2: It is not the good which is common to every being, that is a difference constituting the species of a habit; but some determinate good by reason of suitability to some determinate, viz. the human, nature. In like manner the evil that constitutes a difference of habits is not a pure privation, but something determinate repugnant to a determinate nature.

  Reply to Objection 3: Several good habits about one same specific thing are distinct in reference to their suitability to various natures, as stated above. But several bad habits in respect of one action are distinct in reference to their diverse repugnance to that which is in keeping with nature: thus, various vices about one same matter are contrary to one virtue.

Article: 4 

Whether one habit is made up of many habits?

  Objection 1: It would seem that one habit is made up of many habits. For whatever is engendered, not at once, but little by little, seems to be made up of several parts. But a habit is engendered, not at once, but little by little out of several acts, as stated above (Question [51], Article [3]). Therefore one habit is made up of several.

  Objection 2: Further, a whole is made up of its parts. Now many parts are assigned to one habit: thus Tully assigns many parts of fortitude, temperance, and other virtues. Therefore one habit is made up of many.

  Objection 3: Further, one conclusion suffices both for an act and for a habit of scientific knowledge. But many conclusions belong to but one science, to geometry, for instance, or to arithmetic. Therefore one habit is made up of many.

  On the contrary, A habit, since it is a quality, is a simple form. But nothing simple is made up of many. Therefore one habit is not made up of many.

  I answer that, A habit directed to operation, such as we are chiefly concerned with at present, is a perfection of a power. Now every perfection should be in proportion with that which it perfects. Hence, just as a power, while it is one, extends to many things, in so far as they have something in common, i.e. some general objective aspect, so also a habit extends to many things, in so far as they are related to one, for instance, to some specific objective aspect, or to one nature, or to one principle, as was clearly stated above (Articles [2],3).

   If then we consider a habit as to the extent of its object, we shall find a certain multiplicity therein. But since this multiplicity is directed to one thing, on which the habit is chiefly intent, hence it is that a habit is a simple quality, not composed to several habits, even though it extend to many things. For a habit does not extend to many things save in relation to one, whence it derives its unity.

  Reply to Objection 1: That a habit is engendered little by little, is due, not to one part being engendered after another, but to the fact that the subject does not acquire all at once a firm and difficultly changeable disposition; and also to the fact that it begins by being imperfectly in the subject, and is gradually perfected. The same applies to other qualities.

  Reply to Objection 2: The parts which are assigned to each cardinal virtue, are not integral parts that combine to form a whole; but subjective or potential parts, as we shall explain further on (Question [57], Article [6], ad 4; SS, Question [48]).

  Reply to Objection 3: In any science, he who acquires, by demonstration, scientific knowledge of one conclusion, has the habit indeed, yet imperfectly. And when he obtains, by demonstration, the scientific knowledge of another conclusion, no additional habit is engendered in him: but the habit which was in him previously is perfected, forasmuch as it has increased in extent; because the conclusions and demonstrations of one science are coordinate, and one flows from another.

TREATISE ON HABITS IN PARTICULAR (Questions [55]-89) GOOD HABITS, i.e. VIRTUES (Questions [55]-70)

Question: 55 OF THE VIRTUES, AS TO THEIR ESSENCE (FOUR ARTICLES)

   We come now to the consideration of habits specifically. And since habits, as we have said (Question [54], Article [3]), are divided into good and bad, we must speak in the first place of good habits, which are virtues, and of other matters connected with them, namely the Gifts, Beatitudes and Fruits; in the second place, of bad habits, namely of vices and sins. Now five things must be considered about virtues: (1) the essence of virtue; (2) its subject; (3) the division of virtue; (4) the cause of virtue; (5) certain properties of virtue.

   Under the first head, there are four points of inquiry:

    (1) Whether human virtue is a habit?

    (2) Whether it is an operative habit?

    (3) Whether it is a good habit?

    (4) Of the definition of virtue.

Article: 1 

Whether human virtue is a habit?

  Objection 1: It would seem that human virtue is not a habit: For virtue is "the limit of power" (De Coelo i, text. 116). But the limit of anything is reducible to the genus of that of which it is the limit; as a point is reducible to the genus of line. Therefore virtue is reducible to the genus of power, and not to the genus of habit.

  Objection 2: Further, Augustine says (De Lib. Arb. ii) [*Retract. ix; cf. De Lib. Arb. ii, 19] that "virtue is good use of free-will." But use of free-will is an act. Therefore virtue is not a habit, but an act.

  Objection 3: Further, we do not merit by our habits, but by our actions: otherwise a man would merit continually, even while asleep. But we do merit by our virtues. Therefore virtues are not habits, but acts.

  Objection 4: Further, Augustine says (De Moribus Eccl. xv) that "virtue is the order of love," and (Questions. lxxxiii, qu. 30) that "the ordering which is called virtue consists in enjoying what we ought to enjoy, and using what we ought to use." Now order, or ordering, denominates either an action or a relation. Therefore virtue is not a habit, but an action or a relation.

  Objection 5: Further, just as there are human virtues, so are there natural virtues. But natural virtues are not habits, but powers. Neither therefore are human virtues habits.

  On the contrary, The Philosopher says (Categor. vi) that science and virtue are habits.

  I answer that, Virtue denotes a certain perfection of a power. Now a thing's perfection is considered chiefly in regard to its end. But the end of power is act. Wherefore power is said to be perfect, according as it is determinate to its act.

   Now there are some powers which of themselves are determinate to their acts; for instance, the active natural powers. And therefore these natural powers are in themselves called virtues. But the rational powers, which are proper to man, are not determinate to one particular action, but are inclined indifferently to many: and they are determinate to acts by means of habits, as is clear from what we have said above (Question [49], Article [4]). Therefore human virtues are habits.

  Reply to Objection 1: Sometimes we give the name of a virtue to that to which the virtue is directed, namely, either to its object, or to its act: for instance, we give the name Faith, to that which we believe, or to the act of believing, as also to the habit by which we believe. When therefore we say that "virtue is the limit of power," virtue is taken for the object of virtue. For the furthest point to which a power can reach, is said to be its virtue; for instance, if a man can carry a hundredweight and not more, his virtue [*In English we should say 'strength,' which is the original signification of the Latin 'virtus': thus we speak of an engine being so many horse-power, to indicate its 'strength'] is put at a hundredweight, and not at sixty. But the objection takes virtue as being essentially the limit of power.

  Reply to Objection 2: Good use of free-will is said to be a virtue, in the same sense as above (ad 1); that is to say, because it is that to which virtue is directed as to its proper act. For the act of virtue is nothing else than the good use of free-will.

  Reply to Objection 3: We are said to merit by something in two ways. First, as by merit itself, just as we are said to run by running; and thus we merit by acts. Secondly, we are said to merit by something as by the principle whereby we merit, as we are said to run by the motive power; and thus are we said to merit by virtues and habits.

  Reply to Objection 4: When we say that virtue is the order or ordering of love, we refer to the end to which virtue is ordered: because in us love is set in order by virtue.

  Reply to Objection 5: Natural powers are of themselves determinate to one act: not so the rational powers. And so there is no comparison, as we have said.

Article: 2  

Whether human virtue is an operative habit?

  Objection 1: It would seem that it is not essential to human virtue to be an operative habit. For Tully says (Tuscul. iv) that as health and beauty belong to the body, so virtue belongs to the soul. But health and beauty are not operative habits. Therefore neither is virtue.

  Objection 2: Further, in natural things we find virtue not only in reference to act, but also in reference to being: as is clear from the Philosopher (De Coelo i), since some have a virtue to be always, while some have a virtue to be not always, but at some definite time. Now as natural virtue is in natural things, so is human virtue in rational beings. Therefore also human virtue is referred not only to act, but also to being.

  Objection 3: Further, the Philosopher says (Phys. vii, text. 17) that virtue "is the disposition of a perfect thing to that which is best." Now the best thing to which man needs to be disposed by virtue is God Himself, as Augustine proves (De Moribus Eccl. 3,6, 14) to Whom the soul is disposed by being made like to Him. Therefore it seems that virtue is a quality of the soul in reference to God, likening it, as it were, to Him; and not in reference to operation. It is not, therefore, an operative habit.

  On the contrary, The Philosopher (Ethic. ii, 6) says that "virtue of a thing is that which makes its work good."

  I answer that, Virtue, from the very nature of the word, implies some perfection of power, as we have said above (Article [1]). Wherefore, since power [*The one Latin word 'potentia' is rendered 'potentiality' in the first case, and 'power' in the second] is of two kinds, namely, power in reference to being, and power in reference to act; the perfection of each of these is called virtue. But power in reference to being is on the part of matter, which is potential being, whereas power in reference to act, is on the part of the form, which is the principle of action, since everything acts in so far as it is in act.

   Now man is so constituted that the body holds the place of matter, the soul that of form. The body, indeed, man has in common with other animals; and the same is to be said of the forces which are common to the soul and body: and only those forces which are proper to the soul, namely, the rational forces, belong to man alone. And therefore, human virtue, of which we are speaking now, cannot belong to the body, but belongs only to that which is proper to the soul. Wherefore human virtue does not imply reference to being, but rather to act. Consequently it is essential to human virtue to be an operative habit.

  Reply to Objection 1: Mode of action follows on the disposition of the agent: for such as a thing is, such is its act. And therefore, since virtue is the principle of some kind of operation, there must needs pre-exist in the operator in respect of virtue some corresponding disposition. Now virtue causes an ordered operation. Therefore virtue itself is an ordered disposition of the soul, in so far as, to wit, the powers of the soul are in some way ordered to one another, and to that which is outside. Hence virtue, inasmuch as it is a suitable disposition of the soul, is like health and beauty, which are suitable dispositions of the body. But this does not hinder virtue from being a principle of operation.

  Reply to Objection 2: Virtue which is referred to being is not proper to man; but only that virtue which is referred to works of reason, which are proper to man.

  Reply to Objection 3: As God's substance is His act, the highest likeness of man to God is in respect of some operation. Wherefore, as we have said above (Question [3], Article [2]), happiness or bliss by which man is made most perfectly conformed to God, and which is the end of human life, consists in an operation.

Article: 3

Whether human virtue is a good habit?

  Objection 1: It would seem that it is not essential to virtue that it should be a good habit. For sin is always taken in a bad sense. But there is a virtue even of sin; according to 1 Cor. 15:56: "The virtue [Douay: 'strength'] of sin is the Law." Therefore virtue is not always a good habit.

  Objection 2: Further, Virtue corresponds to power. But power is not only referred to good, but also to evil: according to Is. 5: "Woe to you that are mighty to drink wine, and stout men at drunkenness." Therefore virtue also is referred to good and evil.

  Objection 3: Further, according to the Apostle (2 Cor. 12:9): "Virtue [Douay: 'power'] is made perfect in infirmity." But infirmity is an evil. Therefore virtue is referred not only to good, but also to evil.

  On the contrary, Augustine says (De Moribus Eccl. vi): "No one can doubt that virtue makes the soul exceeding good": and the Philosopher says (Ethic. ii, 6): "Virtue is that which makes its possessor good, and his work good likewise."

  I answer that, As we have said above (Article [1]), virtue implies a perfection of power: wherefore the virtue of a thing is fixed by the limit of its power (De Coelo i). Now the limit of any power must needs be good: for all evil implies defect; wherefore Dionysius says (Div. Hom. ii) that every evil is a weakness. And for this reason the virtue of a thing must be regarded in reference to good. Therefore human virtue which is an operative habit, is a good habit, productive of good works.

  Reply to Objection 1: Just as bad things are said metaphorically to be perfect, so are they said to be good: for we speak of a perfect thief or robber; and of a good thief or robber, as the Philosopher explains (Metaph. v, text. 21). In this way therefore virtue is applied to evil things: so that the "virtue" of sin is said to be law, in so far as occasionally sin is aggravated through the law, so as to attain to the limit of its possibility.

  Reply to Objection 2: The evil of drunkenness and excessive drink, consists in a falling away from the order of reason. Now it happens that, together with this falling away from reason, some lower power is perfect in reference to that which belongs to its own kind, even in direct opposition to reason, or with some falling away therefrom. But the perfection of that power, since it is compatible with a falling away from reason, cannot be called a human virtue.

  Reply to Objection 3: Reason is shown to be so much the more perfect, according as it is able to overcome or endure more easily the weakness of the body and of the lower powers. And therefore human virtue, which is attributed to reason, is said to be "made perfect in infirmity," not of the reason indeed, but of the body and of the lower powers.

Article: 4  

Whether virtue is suitably defined?

  Objection 1: It would seem that the definition, usually given, of virtue, is not suitable, to wit: "Virtue is a good quality of the mind, by which we live righteously, of which no one can make bad use, which God works in us, without us." For virtue is man's goodness, since virtue it is that makes its subject good. But goodness does not seem to be good, as neither is whiteness white. It is therefore unsuitable to describe virtue as a "good quality."

  Objection 2: Further, no difference is more common than its genus; since it is that which divides the genus. But good is more common than quality, since it is convertible with being. Therefore "good" should not be put in the definition of virtue, as a difference of quality.

  Objection 3: Further, as Augustine says (De Trin. xii, 3): "When we come across anything that is not common to us and the beasts of the field, it is something appertaining to the mind." But there are virtues even of the irrational parts; as the Philosopher says (Ethic. iii, 10). Every virtue, therefore, is not a good quality "of the mind."

  Objection 4: Further, righteousness seems to belong to justice; whence the righteous are called just. But justice is a species of virtue. It is therefore unsuitable to put "righteous" in the definition of virtue, when we say that virtue is that "by which we live righteously."

  Objection 5: Further, whoever is proud of a thing, makes bad use of it. But many are proud of virtue, for Augustine says in his Rule, that "pride lies in wait for good works in order to slay them." It is untrue, therefore, "that no one can make bad use of virtue."

  Objection 6: Further, man is justified by virtue. But Augustine commenting on Jn. 15:11: "He shall do greater things than these," says [*Tract. xxvii in Joan.: Serm. xv de Verb. Ap. 11]: "He who created thee without thee, will not justify thee without thee." It is therefore unsuitable to say that "God works virtue in us, without us."

  On the contrary, We have the authority of Augustine from whose words this definition is gathered, and principally in De Libero Arbitrio ii, 19.

  I answer that, This definition comprises perfectly the whole essential notion of virtue. For the perfect essential notion of anything is gathered from all its causes. Now the above definition comprises all the causes of virtue. For the formal cause of virtue, as of everything, is gathered from its genus and difference, when it is defined as "a good quality": for "quality" is the genus of virtue, and the difference, "good." But the definition would be more suitable if for "quality" we substitute "habit," which is the proximate genus.

   Now virtue has no matter "out of which" it is formed, as neither has any other accident; but it has matter "about which" it is concerned, and matter "in which" it exits, namely, the subject. The matter about which virtue is concerned is its object, and this could not be included in the above definition, because the object fixes the virtue to a certain species, and here we are giving the definition of virtue in general. And so for material cause we have the subject, which is mentioned when we say that virtue is a good quality "of the mind."

   The end of virtue, since it is an operative habit, is operation. But it must be observed that some operative habits are always referred to evil, as vicious habits: others are sometimes referred to good, sometimes to evil; for instance, opinion is referred both to the true and to the untrue: whereas virtue is a habit which is always referred to good: and so the distinction of virtue from those habits which are always referred to evil, is expressed in the words "by which we live righteously": and its distinction from those habits which are sometimes directed unto good, sometimes unto evil, in the words, "of which no one makes bad use."

   Lastly, God is the efficient cause of infused virtue, to which this definition applies; and this is expressed in the words "which God works in us without us." If we omit this phrase, the remainder of the definition will apply to all virtues in general, whether acquired or infused.

  Reply to Objection 1: That which is first seized by the intellect is being: wherefore everything that we apprehend we consider as being, and consequently as gone, and as good, which are convertible with being. Wherefore we say that essence is being and is one and is good; and that oneness is being and one and good: and in like manner goodness. But this is not the case with specific forms, as whiteness and health; for everything that we apprehend, is not apprehended with the notion of white and healthy. We must, however, observe that, as accidents and non-subsistent forms are called beings, not as if they themselves had being, but because things are by them; so also are they called good or one, not by some distinct goodness or oneness, but because by them something is good or one. So also is virtue called good, because by it something is good.

  Reply to Objection 2: Good, which is put in the definition of virtue, is not good in general which is convertible with being, and which extends further than quality, but the good as fixed by reason, with regard to which Dionysius says (Div. Nom. iv) "that the good of the soul is to be in accord with reason."

  Reply to Objection 3: Virtue cannot be in the irrational part of the soul, except in so far as this participates in the reason (Ethic. i, 13). And therefore reason, or the mind, is the proper subject of virtue.

  Reply to Objection 4: Justice has a righteousness of its own by which it puts those outward things right which come into human use, and are the proper matter of justice, as we shall show further on (Question [60], Article [2]; SS, Question [58], Article [8]). But the righteousness which denotes order to a due end and to the Divine law, which is the rule of the human will, as stated above (Question [19], Article [4]), is common to all virtues.

  Reply to Objection 5: One can make bad use of a virtue objectively, for instance by having evil thoughts about a virtue, e.g. by hating it, or by being proud of it: but one cannot make bad use of virtue as principle of action, so that an act of virtue be evil.

  Reply to Objection 6: Infused virtue is caused in us by God without any action on our part, but not without our consent. This is the sense of the words, "which God works in us without us." As to those things which are done by us, God causes them in us, yet not without action on our part, for He works in every will and in every nature.

Question: 56 OF THE SUBJECT OF VIRTUE (SIX ARTICLES)

   We now have to consider the subject of virtue, about which there are six points of inquiry:

    (1) Whether the subject of virtue is a power of the soul?

    (2) Whether one virtue can be in several powers?

    (3) Whether the intellect can be the subject of virtue?

    (4) Whether the irascible and concupiscible faculties can be the subject of virtue?

    (5) Whether the sensitive powers of apprehension can be the subject of virtue?

    (6) Whether the will can be the subject of virtue?
 
Article: 1 

Whether the subject of virtue is a power of the soul?

  Objection 1: It would seem that the subject of virtue is not a power of the soul. For Augustine says (De Lib. Arb. ii, 19) that "virtue is that by which we live righteously." But we live by the essence of the soul, and not by a power of the soul. Therefore virtue is not a power, but in the essence of the soul.

  Objection 2: Further, the Philosopher says (Ethic. ii, 6) that "virtue is that which makes its possessor good, and his work good likewise." But as work is set up by power, so he that has a virtue is set up by the essence of the soul. Therefore virtue does not belong to the power, any more than to the essence of the soul.

  Objection 3: Further, power is in the second species of quality. But virtue is a quality, as we have said above (Question [55], Article [4]): and quality is not the subject of quality. Therefore a power of the soul is not the subject of virtue.

  On the contrary, "Virtue is the limit of power" (De Coelo ii). But the limit is in that of which it is the limit. Therefore virtue is in a power of the soul.

  I answer that, It can be proved in three ways that virtue belongs to a power of the soul. First, from the notion of the very essence of virtue, which implies perfection of a power; for perfection is in that which it perfects. Secondly, from the fact that virtue is an operative habit, as we have said above (Question [55], Article [2]): for all operation proceeds from the soul through a power. Thirdly, from the fact that virtue disposes to that which is best: for the best is the end, which is either a thing's operation, or something acquired by an operation proceeding from the thing's power. Therefore a power of the soul is the subject of virtue.

  Reply to Objection 1: "To live" may be taken in two ways. Sometimes it is taken for the very existence of the living thing: in this way it belongs to the essence of the soul, which is the principle of existence in the living thing. But sometimes "to live" is taken for the operation of the living thing: in this sense, by virtue we live righteously, inasmuch as by virtue we perform righteous actions.

  Reply to Objection 2: Good is either the end, or something referred to the end. And therefore, since the good of the worker consists in the work, this fact also, that virtue makes the worker good, is referred to the work, and consequently, to the power.

  Reply to Objection 3: One accident is said to be the subject of another, not as though one accident could uphold another; but because one accident inheres to substance by means of another, as color to the body by means of the surface; so that surface is said to be the subject of color. In this way a power of the soul is said to be the subject of virtue.

Article: 2  

Whether one virtue can be in several powers?

  Objection 1: It would seem that one virtue can be in several powers. For habits are known by their acts. But one act proceeds in various way from several powers: thus walking proceeds from the reason as directing, from the will as moving, and from the motive power as executing. Therefore also one habit can be in several powers.

  Objection 2: Further, the Philosopher says (Ethic. ii, 4) that three things are required for virtue, namely: "to know, to will, and to work steadfastly." But "to know" belongs to the intellect, and "to will" belongs to the will. Therefore virtue can be in several powers.

  Objection 3: Further, prudence is in the reason since it is "the right reason of things to be done" (Ethic. vi, 5). And it is also in the will: for it cannot exist together with a perverse will (Ethic. vi, 12). Therefore one virtue can be in two powers.

  On the contrary, The subject of virtue is a power of the soul. But the same accident cannot be in several subjects. Therefore one virtue cannot be in several powers of the soul.

  I answer that, It happens in two ways that one thing is subjected in two. First, so that it is in both on an equal footing. In this way it is impossible for one virtue to be in two powers: since diversity of powers follows the generic conditions of the objects, while diversity of habits follows the specific conditions thereof: and so wherever there is diversity of powers, there is diversity of habits; but not vice versa. In another way one thing can be subjected in two or more, not on an equal footing, but in a certain order. And thus one virtue can belong to several powers, so that it is in one chiefly, while it extends to others by a kind of diffusion, or by way of a disposition, in so far as one power is moved by another, and one power receives from another.

  Reply to Objection 1: One act cannot belong to several powers equally, and in the same degree; but only from different points of view, and in various degrees.

  Reply to Objection 2: "To know" is a condition required for moral virtue, inasmuch as moral virtue works according to right reason. But moral virtue is essentially in the appetite.

  Reply to Objection 3: Prudence is really subjected in reason: but it presupposes as its principle the rectitude of the will, as we shall see further on (Article [3]; Question [57], Article [4]).
 
Article: 3 

Whether the intellect can be the subject of virtue?

  Objection 1: It would seem that the intellect is not the subject of virtue. For Augustine says (De Moribus Eccl. xv) that all virtue is love. But the subject of love is not the intellect, but the appetitive power alone. Therefore no virtue is in the intellect.

  Objection 2: Further, virtue is referred to good, as is clear from what has been said above (Question [55], Article [3]). Now good is not the object of the intellect, but of the appetitive power. Therefore the subject of virtue is not the intellect, but the appetitive power.

  Objection 3: Further, virtue is that "which makes its possessor good," as the Philosopher says (Ethic. ii, 6). But the habit which perfects the intellect does not make its possessor good: since a man is not said to be a good man on account of his science or his art. Therefore the intellect is not the subject of virtue.

  On the contrary, The mind is chiefly called the intellect. But the subject of virtue is the mind, as is clear from the definition, above given, of virtue (Question [55], Article [4]). Therefore the intellect is the subject of virtue.

  I answer that, As we have said above (Question [55], Article [3]), a virtue is a habit by which we work well. Now a habit may be directed to a good act in two ways. First, in so far as by the habit a man acquires an aptness to a good act; for instance, by the habit of grammar man has the aptness to speak correctly. But grammar does not make a man always speak correctly: for a grammarian may be guilty of a barbarism or make a solecism: and the case is the same with other sciences and arts. Secondly, a habit may confer not only aptness to act, but also the right use of that aptness: for instance, justice not only gives man the prompt will to do just actions, but also makes him act justly.

   And since good, and, in like manner, being, is said of a thing simply, in respect, not of what it is potentially, but of what it is actually: therefore from having habits of the latter sort, man is said simply to do good, and to be good; for instance, because he is just, or temperate; and in like manner as regards other such virtues. And since virtue is that "which makes its possessor good, and his work good likewise," these latter habits are called virtuous simply: because they make the work to be actually good, and the subject good simply. But the first kind of habits are not called virtues simply: because they do not make the work good except in regard to a certain aptness, nor do they make their possessor good simply. For through being gifted in science or art, a man is said to be good, not simply, but relatively; for instance, a good grammarian or a good smith. And for this reason science and art are often divided against virtue; while at other times they are called virtues (Ethic. vi, 2).

   Hence the subject of a habit which is called a virtue in a relative sense, can be the intellect, and not only the practical intellect, but also the speculative, without any reference to the will: for thus the Philosopher (Ethic. vi, 3) holds that science, wisdom and understanding, and also art, are intellectual virtues. But the subject of a habit which is called a virtue simply, can only be the will, or some power in so far as it is moved by the will. And the reason of this is, that the will moves to their acts all those other powers that are in some way rational, as we have said above (Question [9], Article [1]; Question [17], Articles [1],5; FP, Question [82], Article [4]): and therefore if man do well actually, this is because he has a good will. Therefore the virtue which makes a man to do well actually, and not merely to have the aptness to do well, must be either in the will itself; or in some power as moved by the will.

   Now it happens that the intellect is moved by the will, just as are the other powers: for a man considers something actually, because he wills to do so. And therefore the intellect, in so far as it is subordinate to the will, can be the subject of virtue absolutely so called. And in this way the speculative intellect, or the reason, is the subject of Faith: for the intellect is moved by the command of the will to assent to what is of faith: for "no man believeth, unless he will" [*Augustine: Tract. xxvi in Joan.]. But the practical intellect is the subject of prudence. For since prudence is the right reason of things to be done, it is a condition thereof that man be rightly disposed in regard to the principles of this reason of things to be done, that is in regard to their ends, to which man is rightly disposed by the rectitude of the will, just as to the principles of speculative truth he is rightly disposed by the natural light of the active intellect. And therefore as the subject of science, which is the right reason of speculative truths, is the speculative intellect in its relation to the active intellect, so the subject of prudence is the practical intellect in its relation to the right will.

  Reply to Objection 1: The saying of Augustine is to be understood of virtue simply so called: not that every virtue is love simply: but that it depends in some way on love, in so far as it depends on the will, whose first movement consists in love, as we have said above (Question [25], Articles [1],2,3; Question [27], Article [4]; FP, Question [20], Article [1]).

  Reply to Objection 2: The good of each thing is its end: and therefore, as truth is the end of the intellect, so to know truth is the good act of the intellect. Whence the habit, which perfects the intellect in regard to the knowledge of truth, whether speculative or practical, is a virtue.

  Reply to Objection 3: This objection considers virtue simply so called.
 
Article: 4  

Whether the irascible and concupiscible powers are the subject of virtue?

  Objection 1: It would seem that the irascible and concupiscible powers cannot be the subject of virtue. For these powers are common to us and dumb animals. But we are now speaking of virtue as proper to man, since for this reason it is called human virtue. It is therefore impossible for human virtue to be in the irascible and concupiscible powers which are parts of the sensitive appetite, as we have said in the FP, Question [81], Article [2].

  Objection 2: Further, the sensitive appetite is a power which makes use of a corporeal organ. But the good of virtue cannot be in man's body: for the Apostle says (Rm. 7): "I know that good does not dwell in my flesh." Therefore the sensitive appetite cannot be the subject of virtue.

  Objection 3: Further, Augustine proves (De Moribus Eccl. v) that virtue is not in the body but in the soul, for the reason that the body is ruled by the soul: wherefore it is entirely due to his soul that a man make good use of his body: "For instance, if my coachman, through obedience to my orders, guides well the horses which he is driving; this is all due to me." But just as the soul rules the body, so also does the reason rule the sensitive appetite. Therefore that the irascible and concupiscible powers are rightly ruled, is entirely due to the rational powers. Now "virtue is that by which we live rightly," as we have said above (Question [55], Article [4]). Therefore virtue is not in the irascible and concupiscible powers, but only in the rational powers.

  Objection 4: Further, "the principal act of moral virtue is choice" (Ethic. viii, 13). Now choice is not an act of the irascible and concupiscible powers, but of the rational power, as we have said above (Question [13], Article [2]). Therefore moral virtue is not in the irascible and concupiscible powers, but in the reason.

  On the contrary, Fortitude is assigned to the irascible power, and temperance to the concupiscible power. Whence the Philosopher (Ethic. iii, 10) says that "these virtues belong to the irrational part of the soul."

  I answer that, The irascible and concupiscible powers can be considered in two ways. First, in themselves, in so far as they are parts of the sensitive appetite: and in this way they are not competent to be the subject of virtue. Secondly, they can be considered as participating in the reason, from the fact that they have a natural aptitude to obey reason. And thus the irascible or concupiscible power can be the subject of human virtue: for, in so far as it participates in the reason, it is the principle of a human act. And to these powers we must needs assign virtues.

   For it is clear that there are some virtues in the irascible and concupiscible powers. Because an act, which proceeds from one power according as it is moved by another power, cannot be perfect, unless both powers be well disposed to the act: for instance, the act of a craftsman cannot be successful unless both the craftsman and his instrument be well disposed to act. Therefore in the matter of the operations of the irascible and concupiscible powers, according as they are moved by reason, there must needs be some habit perfecting in respect of acting well, not only the reason, but also the irascible and concupiscible powers. And since the good disposition of the power which moves through being moved, depends on its conformity with the power that moves it: therefore the virtue which is in the irascible and concupiscible powers is nothing else but a certain habitual conformity of these powers to reason.

  Reply to Objection 1: The irascible and concupiscible powers considered in themselves, as parts of the sensitive appetite, are common to us and dumb animals. But in so far as they are rational by participation, and are obedient to the reason, they are proper to man. And in this way they can be the subject of human virtue.

  Reply to Objection 2: Just as human flesh has not of itself the good of virtue, but is made the instrument of a virtuous act, inasmuch as being moved by reason, we "yield our members to serve justice"; so also, the irascible and concupiscible powers, of themselves indeed, have not the good of virtue, but rather the infection of the "fomes": whereas, inasmuch as they are in conformity with reason, the good of reason is begotten in them.

  Reply to Objection 3: The body is ruled by the soul, and the irascible and concupiscible powers by the reason, but in different ways. For the body obeys the soul blindly without any contradiction, in those things in which it has a natural aptitude to be moved by the soul: whence the Philosopher says (Polit. i, 3) that the "soul rules the body with a despotic command" as the master rules his slave: wherefore the entire movement of the body is referred to the soul. For this reason virtue is not in the body, but in the soul. But the irascible and concupiscible powers do not obey the reason blindly; on the contrary, they have their own proper movements, by which, at times, they go against reason, whence the Philosopher says (Polit. i, 3) that the "reason rules the irascible and concupiscible powers by a political command" such as that by which free men are ruled, who have in some respects a will of their own. And for this reason also must there be some virtues in the irascible and concupiscible powers, by which these powers are well disposed to act.

  Reply to Objection 4: In choice there are two things, namely, the intention of the end, and this belongs to the moral virtue; and the preferential choice of that which is unto the end, and this belongs to prudence (Ethic. vi, 2,5). But that the irascible and concupiscible powers have a right intention of the end in regard to the passions of the soul, is due to the good disposition of these powers. And therefore those moral virtues which are concerned with the passions are in the irascible and concupiscible powers, but prudence is in the reason.
 
Article: 5  

Whether the sensitive powers of apprehension are the subject of virtue?

  Objection 1: It would seem that it is possible for virtue to be in the interior sensitive powers of apprehension. For the sensitive appetite can be the subject of virtue, in so far as it obeys reason. But the interior sensitive powers of apprehension obey reason: for the powers of imagination, of cogitation, and of memory [*Cf. FP, Question [78], Article [4]] act at the command of reason. Therefore in these powers there can be virtue.

  Objection 2: Further, as the rational appetite, which is the will, can be hindered or helped in its act, by the sensitive appetite, so also can the intellect or reason be hindered or helped by the powers mentioned above. As, therefore, there can be virtue in the interior powers of appetite, so also can there be virtue in the interior powers of apprehension.

  Objection 3: Further, prudence is a virtue, of which Cicero (De Invent. Rhetor. ii) says that memory is a part. Therefore also in the power of memory there can be a virtue: and in like manner, in the other interior sensitive powers of apprehension.

  On the contrary, All virtues are either intellectual or moral (Ethic. ii, 1). Now all the moral virtues are in the appetite; while the intellectual virtues are in the intellect or reason, as is clear from Ethic. vi, 1. Therefore there is no virtue in the interior sensitive powers of apprehension.

  I answer that, In the interior sensitive powers of apprehension there are some habits. And this is made clear principally from what the Philosopher says (De Memoria ii), that "in remembering one thing after another, we become used to it; and use is a second nature." Now a habit of use is nothing else than a habit acquired by use, which is like unto nature. Wherefore Tully says of virtue in his Rhetoric that "it is a habit like a second nature in accord with reason." Yet, in man, that which he acquires by use, in his memory and other sensitive powers of apprehension, is not a habit properly so called, but something annexed to the habits of the intellective faculty, as we have said above (Question [50], Article [4], ad 3).

   Nevertheless even if there be habits in such powers, they cannot be virtues. For virtue is a perfect habit, by which it never happens that anything but good is done: and so virtue must needs be in that power which consummates the good act. But the knowledge of truth is not consummated in the sensitive powers of apprehension: for such powers prepare the way to the intellective knowledge. And therefore in these powers there are none of the virtues, by which we know truth: these are rather in the intellect or reason.

  Reply to Objection 1: The sensitive appetite is related to the will, which is the rational appetite, through being moved by it. And therefore the act of the appetitive power is consummated in the sensitive appetite: and for this reason the sensitive appetite is the subject of virtue. Whereas the sensitive powers of apprehension are related to the intellect rather through moving it; for the reason that the phantasms are related to the intellective soul, as colors to sight (De Anima iii, text. 18). And therefore the act of knowledge is terminated in the intellect; and for this reason the cognoscitive virtues are in the intellect itself, or the reason.

   And thus is made clear the Reply to the Second Objection.

  Reply to Objection 3: Memory is not a part of prudence, as species is of a genus, as though memory were a virtue properly so called: but one of the conditions required for prudence is a good memory; so that, in a fashion, it is after the manner of an integral part.

Article: 6  

Whether the will can be the subject of virtue?

  Objection 1: It would seem that the will is not the subject of virtue. Because no habit is required for that which belongs to a power by reason of its very nature. But since the will is in the reason, it is of the very essence of the will, according to the Philosopher (De Anima iii, text. 42), to tend to that which is good, according to reason. And to this good every virtue is ordered, since everything naturally desires its own proper good; for virtue, as Tully says in his Rhetoric, is a "habit like a second nature in accord with reason." Therefore the will is not the subject of virtue.

  Objection 2: Further, every virtue is either intellectual or moral (Ethic. i, 13; ii, 1). But intellectual virtue is subjected in the intellect and reason, and not in the will: while moral virtue is subjected in the irascible and concupiscible powers which are rational by participation. Therefore no virtue is subjected in the will.

  Objection 3: Further, all human acts, to which virtues are ordained, are voluntary. If therefore there be a virtue in the will in respect of some human acts, in like manner there will be a virtue in the will in respect of all human acts. Either, therefore, there will be no virtue in any other power, or there will be two virtues ordained to the same act, which seems unreasonable. Therefore the will cannot be the subject of virtue.

  On the contrary, Greater perfection is required in the mover than in the moved. But the will moves the irascible and concupiscible powers. Much more therefore should there be virtue in the will than in the irascible and concupiscible powers.

  I answer that, Since the habit perfects the power in reference to act, then does the power need a habit perfecting it unto doing well, which habit is a virtue, when the power's own proper nature does not suffice for the purpose.

   Now the proper nature of a power is seen in its relation to its object. Since, therefore, as we have said above (Question [19], Article [3]), the object of the will is the good of reason proportionate to the will, in respect of this the will does not need a virtue perfecting it. But if man's will is confronted with a good that exceeds its capacity, whether as regards the whole human species, such as Divine good, which transcends the limits of human nature, or as regards the individual, such as the good of one's neighbor, then does the will need virtue. And therefore such virtues as those which direct man's affections to God or to his neighbor are subjected in the will, as charity, justice, and such like.

  Reply to Objection 1: This objection is true of those virtues which are ordained to the willer's own good; such as temperance and fortitude, which are concerned with the human passions, and the like, as is clear from what we have said (Question [35], Article [6]).

  Reply to Objection 2: Not only the irascible and concupiscible powers are rational by participation but "the appetitive power altogether," i.e. in its entirety (Ethic. i, 13). Now the will is included in the appetitive power. And therefore whatever virtue is in the will must be a moral virtue, unless it be theological, as we shall see later on (Question [62], Article [3]).

  Reply to Objection 3: Some virtues are directed to the good of moderated passion, which is the proper good of this or that man: and in these cases there is no need for virtue in the will, for the nature of the power suffices for the purpose, as we have said. This need exists only in the case of virtues which are directed to some extrinsic good.

Question: 57 OF THE INTELLECTUAL VIRTUES (SIX ARTICLES)

   We now have to consider the various kinds of virtue: and (1) the intellectual virtues; (2) the moral virtues; (3) the theological virtues. Concerning the first there are six points of inquiry:

    (1) Whether habits of the speculative intellect are virtues?

    (2) Whether they are three, namely, wisdom, science and understanding?

    (3) Whether the intellectual habit, which is art, is a virtue?

    (4) Whether prudence is a virtue distinct from art?

    (5) Whether prudence is a virtue necessary to man?

    (6) Whether "eubulia," "synesis" and "gnome" are virtues annexed to prudence?
 
Article: 1 

Whether the habits of the speculative intellect are virtues?

  Objection 1: It would seem that the habits of the speculative intellect are not virtues. For virtue is an operative habit, as we have said above (Question [55], Article [2]). But speculative habits are not operative: for speculative matter is distinct from practical, i.e. operative matter. Therefore the habits of the speculative intellect are not virtues.

  Objection 2: Further, virtue is about those things by which man is made happy or blessed: for "happiness is the reward of virtue" (Ethic. i, 9). Now intellectual habits do not consider human acts or other human goods, by which man acquires happiness, but rather things pertaining to nature or to God. Therefore such like habits cannot be called virtues.

  Objection 3: Further, science is a speculative habit. But science and virtue are distinct from one another as genera which are not subalternate, as the Philosopher proves in Topic. iv. Therefore speculative habits are not virtues.

  On the contrary, The speculative habits alone consider necessary things which cannot be otherwise than they are. Now the Philosopher (Ethic. vi, 1) places certain intellectual virtues in that part of the soul which considers necessary things that cannot be otherwise than they are. Therefore the habits of the speculative intellect are virtues.

  I answer that, Since every virtue is ordained to some good, as stated above (Question [55], Article [3]), a habit, as we have already observed (Question [56], Article [3]), may be called a virtue for two reasons: first, because it confers aptness in doing good; secondly, because besides aptness, it confers the right use of it. The latter condition, as above stated (Question [55], Article [3]), belongs to those habits alone which affect the appetitive part of the soul: since it is the soul's appetitive power that puts all the powers and habits to their respective uses.

   Since, then, the habits of the speculative intellect do not perfect the appetitive part, nor affect it in any way, but only the intellective part; they may indeed be called virtues in so far as they confer aptness for a good work, viz. the consideration of truth (since this is the good work of the intellect): yet they are not called virtues in the second way, as though they conferred the right use of a power or habit. For if a man possess a habit of speculative science, it does not follow that he is inclined to make use of it, but he is made able to consider the truth in those matters of which he has scientific knowledge: that he make use of the knowledge which he has, is due to the motion of his will. Consequently a virtue which perfects the will, as chari