Summa Theologica


Question: 51  OF THE IMPEDIMENT OF ERROR (TWO ARTICLES)

   We must now consider the impediments to matrimony in particular, and in the first place the impediment of error. Under this head there are two points of inquiry:

    (1) Whether error of its very nature is an impediment to matrimony?

    (2) What kind of error?

Article: 1 

Whether it is right to reckon error as an impediment to marriage?

  Objection 1: It would seem that error should not be reckoned in itself an impediment to marriage. For consent, which is the efficient cause of marriage, is hindered in the same way as the voluntary. Now the voluntary, according to the Philosopher (Ethic. iii, 1), may be hindered by ignorance. But ignorance is not the same as error, because ignorance excludes knowledge altogether, whereas error does not, since "error is to approve the false as though it were true," according to Augustine (De Trin. ix, 11). Therefore ignorance rather than error should have been reckoned here as an impediment to marriage.

  Objection 2: Further, that which of its very nature can be an impediment to marriage is in opposition to the good of marriage. But error is not a thing of this kind. Therefore error is not by its very nature an impediment to marriage.

  Objection 3: Further, just as consent is required for marriage, so is intention required for baptism. Now if one were to baptize John, thinking to baptize Peter, John would be baptized none the less. Therefore error does not annul matrimony.

  Objection 4: Further, there was true marriage between Lia and Jacob, and yet, in this case, there was error. Therefore error does not annul a marriage.

  On the contrary, It is said in the Digests (Si per errorem, ff. De jurisdic. omn. judic.): "What is more opposed to consent than error?" Now consent is required for marriage. Therefore error is an impediment to matrimony.

   Further, consent denotes something voluntary. Now error is an obstacle to the voluntary, since "the voluntary," according to the Philosopher (Ethic. iii, 1), Damascene (De Fide Orth. ii, 24), and Gregory of Nyssa [*Nemesius] (De Nat. Hom. xxxii), "is that which has its principle in one who has knowledge of singulars which are the matter of actions." But this does not apply to one who is in error. Therefore error is an impediment to matrimony.

  I answer that, Whatever hinders a cause, of its very nature hinders the effect likewise. Now consent is the cause of matrimony, as stated above (Question [45], Article [1]). Hence whatever voids the consent, voids marriage. Now consent is an act of the will, presupposing an act of the intellect; and if the first be lacking, the second must needs be lacking also. Hence, when error hinders knowledge, there follows a defect in the consent also, and consequently in the marriage. Therefore it is possible according to the natural law for error to void marriage.

  Reply to Objection 1: Speaking simply, ignorance differs from error, because ignorance does not of its very nature imply an act of knowledge, while error supposes a wrong judgment of reason about something. However, as regards being an impediment to the voluntary, it differs not whether we call it ignorance or error, since no ignorance can be an impediment to the voluntary, unless it have error in conjunction with it, because the will's act presupposes an estimate or judgment about something which is the object of the will. Wherefore if there be ignorance there must needs be error; and for this reason error is set down as being the proximate cause.

  Reply to Objection 2: Although error is not of itself contrary to matrimony, it is contrary thereto as regards the cause of marriage.

  Reply to Objection 3: The character of baptism is not caused directly by the intention of the baptizer, but by the material element applied outwardly; and the intention is effective only as directing the material element to its effect; whereas the marriage tie is caused by the consent directly. Hence the comparison fails.

  Reply to Objection 4: According to the Master (Sent. iv, D, 30) the marriage between Lia and Jacob was effected not by their coming together, which happened through an error, but by their consent, which followed afterwards. Yet both are clearly to be excused from sin (Sent. iv, D, 30).

Article: 2 

Whether every error is an impediment to matrimony?

  Objection 1: It would seem that every error is an impediment to matrimony, and not, as stated in the text (Sent. iv, D, 30), only error about the condition or the person. For that which applies to a thing as such applies to it in all its bearings. Now error is of its very nature an impediment to matrimony, as stated above (Article [1]). Therefore every error is an impediment to matrimony.

  Objection 2: Further, if error, as such, is an impediment to matrimony, the greater the error the greater the impediment. Now the error concerning faith in a heretic who disbelieves in this sacrament is greater than an error concerning the person. Therefore it should be a greater impediment than error about the person.

  Objection 3: Further, error does not void marriage except as removing voluntariness. Now ignorance about any circumstance takes away voluntariness (Ethic. iii, 1). Therefore it is not only error about condition or person that is an impediment to matrimony.

  Objection 4: Further, just as the condition of slavery is an accident affecting the person, so are bodily or mental qualities. But error regarding the condition is an impediment to matrimony. Therefore error concerning quality or fortune is equally an impediment.

  Objection 5: Further, just as slavery or freedom pertains to the condition of person, so do high and low rank, or dignity of position and the lack thereof. Now error regarding the condition of slavery is an impediment to matrimony. Therefore error about the other matters mentioned is also an impediment.

  Objection 6: Further, just as the condition of slavery is an impediment, so are difference of worship and impotence, as we shall say further on (Question [52], Article [2]; Question [58], Article [1]; Question [59], Article [1]). Therefore just as error regarding the condition is an impediment, so also should error about those other matters be reckoned an impediment.

  Objection 7: On the other hand, it would seem that not even error about the person is an impediment to marriage. For marriage is a contract even as a sale is. Now in buying and selling the sale is not voided if one coin be given instead of another of equal value. Therefore a marriage is not voided if one woman be taken instead of another.

  Objection 8: Further, it is possible for them to remain in this error for many years and to beget between them sons and daughters. But it would be a grave assertion to maintain that they ought to be separated then. Therefore their previous error did not void their marriage.

  Objection 9: Further, it might happen that the woman is betrothed to the brother of the man whom she thinks that she is consenting to marry, and that she has had carnal intercourse with him; in which case, seemingly, she cannot go back to the man to whom she thought to give her consent, but should hold on to his brother. Thus error regarding the person is not an impediment to marriage.

  I answer that, Just as error, through causing involuntariness, is an excuse from sin, so on the same count is it an impediment to marriage. Now error does not excuse from sin unless it refer to a circumstance the presence or absence of which makes an action lawful or unlawful. For if a man were to strike his father with an iron rod thinking it to be of wood, he is not excused from sin wholly, although perhaps in part; but if a man were to strike his father, thinking to strike his son to correct him, he is wholly excused provided he take due care. Wherefore error, in order to void marriage, must needs be about the essentials of marriage. Now marriage includes two things, namely the two persons who are joined together, and the mutual power over one another wherein marriage consists. The first of these is removed by error concerning the person, the second by error regarding the condition, since a slave cannot freely give power over his body to another, without his master's consent. For this reason these two errors, and no others, are an impediment to matrimony.

  Reply to Objection 1: It is not from its generic nature that error is an impediment to marriage, but from the nature of the difference added thereto; namely from its being error about one of the essentials to marriage.

  Reply to Objection 2: An error of faith about matrimony is about things consequent upon matrimony, for instance on the question of its being a sacrament, or of its being lawful. Wherefore such error as these is no impediment to marriage, as neither does an error about baptism hinder a man from receiving the character, provided he intend to receive what the Church gives, although he believe it to be nothing.

  Reply to Objection 3: It is not any ignorance of a circumstance that causes the involuntariness which is an excuse from sin, as stated above; wherefore the argument does not prove.

  Reply to Objection 4: Difference of fortune or of quality does not make a difference in the essentials to matrimony, as the condition of slavery does. Hence the argument does not prove.

  Reply to Objection 5: Error about a person's rank, as such, does not void a marriage, for the same reason as neither does error about a personal quality. If, however, the error about a person's rank or position amounts to an error about the person, it is an impediment to matrimony. Hence, if the woman consent directly to this particular person, her error about his rank does not void the marriage; but if she intend directly to consent to marry the king's son, whoever he may be, then, if another man than the king's son be brought to her, there is error about the person, and the marriage will be void.

  Reply to Objection 6: Error is an impediment to matrimony, although it be about other impediments to marriage if it concern those things which render a person an unlawful subject of marriage. But (the Master) does not mention error about such things, because they are an impediment to marriage whether there be error about them or not; so that if a woman contract with a subdeacon, whether she know this or not, there is no marriage; whereas the condition of slavery is no impediment if the slavery be known. Hence the comparison fails.

  Reply to Objection 7: In contracts money is regarded as the measure of other things (Ethic. v, 5), and not as being sought for its own sake. Hence if the coin paid is not what it is thought to be but another of equal value, this does not void the contract. But if there be error about a thing sought for its own sake, the contract is voided, for instance if one were to sell a donkey for a horse; and thus it is in the case in point.

  Reply to Objection 8: No matter how long they have cohabited, unless she be willing to consent again, there is no marriage.

  Reply to Objection 9: If she did not consent previously to marry his brother, she may hold to the one whom she took in error. Nor can she return to his brother, especially if there has been carnal intercourse between her and the man she took to husband. If, however, she had previously consented to take the first one in words of the present, she cannot have the second while the first lives. But she may either leave the second or return to the first; and ignorance of the fact excuses her from sin, just as she would be excused if after the consummation of the marriage a kinsman of her husband were to know her by fraud since she is not to be blamed for the other's deceit.

Question: 52 OF THE IMPEDIMENT OF THE CONDITION OF SLAVERY (FOUR ARTICLES)

   We must now consider the impediment of the condition of slavery. Under this head there are four points of inquiry:

    (1) Whether the condition of slavery is an impediment to matrimony?

    (2) Whether a slave can marry without his master's consent?

    (3) Whether a man who is already married can make himself a slave without his wife's consent?

    (4) Whether the children should follow the condition of their father or of their mother?
 
Article: 1

Whether the condition of slavery is an impediment to matrimony?

  Objection 1: It would seem that the condition of slavery is no impediment to matrimony. For nothing is an impediment to marriage except what is in some way opposed to it. But slavery is in no way opposed to marriage, else there could be no marriage among slaves. Therefore slavery is no impediment to marriage.

  Objection 2: Further, that which is contrary to nature cannot be an impediment to that which is according to nature. Now slavery is contrary to nature, for as Gregory says (Pastor. ii, 6), "it is contrary to nature for man to wish to lord it over another man"; and this is also evident from the fact that it was said of man (Gn. 1:26) that he should "have dominion over the fishes of the sea," but not that he should have dominion over man. Therefore it cannot be an impediment to marriage, which is a natural thing.

  Objection 3: Further, if it is an impediment, this is either of natural law or of positive law. But it is not of natural law, since according to natural law all men are equal, as Gregory says (Pastor. ii, 6), while it is stated at the beginning of the Digests (Manumissiones, ff. de just. et jure.) that slavery is not of natural law; and positive law springs from the natural law, as Tully says (De Invent. ii). Therefore, according to law, slavery is not an impediment to any marriage.

  Objection 4: Further, that which is an impediment to marriage is equally an impediment whether it be known or not, as in the case of consanguinity. Now the slavery of one party, if it be known to the other, is no impediment to their marriage. Therefore slavery, considered in itself, is unable to void a marriage; and consequently it should not be reckoned by itself as a distinct impediment to marriage.

  Objection 5: Further, just as one may be in error about slavery, so as to deem a person free who is a slave, so may one be in error about freedom, so as to deem a person a slave whereas he is free. But freedom is not accounted an impediment to matrimony. Therefore neither should slavery be so accounted.

  Objection 7: Further, leprosy is a greater burden to the fellowship of marriage and is a greater obstacle to the good of the offspring than slavery is. Yet leprosy is not reckoned an impediment to marriage. Therefore neither should slavery be so reckoned.

  On the contrary, A Decretal says (De conjug. servorum, cap. Ad nostram) that "error regarding the condition hinders a marriage from being contracted and voids that which is already contracted."

   Further, marriage is one of the goods that are sought for their own sake, because it is qualified by honesty; whereas slavery is one of the things to be avoided for their own sake. Therefore marriage and slavery are contrary to one another; and consequently slavery is an impediment to matrimony.

  I answer that, In the marriage contract one party is bound to the other in the matter of paying the debt; wherefore if one who thus binds himself is unable to pay the debt, ignorance of this inability, on the side of the party to whom he binds himself, voids the contract. Now just as impotence in respect of coition makes a person unable to pay the debt, so that he is altogether disabled, so slavery makes him unable to pay it freely. Therefore, just as ignorance or impotence in respect of coition is an impediment if not known but not if known, as we shall state further on (Question [58]), so the condition of slavery is an impediment if not known, but not if it be known.

  Reply to Objection 1: Slavery is contrary to marriage as regards the act to which marriage binds one party in relation to the other, because it prevents the free execution of that act; and again as regards the good of the offspring who become subject to the same condition by reason of the parent's slavery. Since, however, it is free to everyone to suffer detriment in that which is his due, if one of the parties knows the other to be a slave, the marriage is none the less valid. Likewise since in marriage there is an equal obligation on either side to pay the debt, neither party can exact of the other a greater obligation than that under which he lies; so that if a slave marry a bondswoman, thinking her to be free, the marriage is not thereby rendered invalid. It is therefore evident that slavery is no impediment to marriage except when it is unknown to the other party, even though the latter be in a condition of freedom; and so nothing prevents marriage between slaves, or even between a freeman and a bondswoman.

  Reply to Objection 2: Nothing prevents a thing being against nature as to the first intention of nature, and yet not against nature as to its second intention. Thus, as stated in De Coelo, ii, all corruption, defect, and old age are contrary to nature, because nature intends being and perfection, and yet they are not contrary to the second intention of nature, because nature, through being unable to preserve being in one thing, preserves it in another which is engendered of the other's corruption. And when nature is unable to bring a thing to a greater perfection it brings it to a lesser; thus when it cannot produce a male it produces a female which is "a misbegotten male" (De Gener. Animal. ii, 3). I say then in like manner that slavery is contrary to the first intention of nature. Yet it is not contrary to the second, because natural reason has this inclination, and nature has this desire---that everyone should be good; but from the fact that a person sins, nature has an inclination that he should be punished for his sin, and thus slavery was brought in as a punishment of sin. Nor is it unreasonable for a natural thing to be hindered by that which is unnatural in this way; for thus is marriage hindered by impotence of coition, which impotence is contrary to nature in the way mentioned.

  Reply to Objection 3: The natural law requires punishment to be inflicted for guilt, and that no one should be punished who is not guilty; but the appointing of the punishment according to the circumstances of person and guilt belongs to positive law. Hence slavery which is a definite punishment is of positive law, and arises out of natural law, as the determinate from that which is indeterminate. And it arises from the determination of the same positive law that slavery if unknown is an impediment to matrimony, lest one who is not guilty be punished; for it is a punishment to the wife to have a slave for husband, and "vice versa."

  Reply to Objection 4: Certain impediments render a marriage unlawful; and since it is not our will that makes a thing lawful or unlawful, but the law to which our will ought to be subject, it follows that the validity or invalidity of a marriage is not affected either by ignorance (such as destroys voluntariness) of the impediment or by knowledge thereof; and such an impediment is affinity or a vow, and others of the same kind. other impediments, however, render a marriage ineffectual as to the payment of the debt; and since it is within the competency of our will to remit a debt that is due to us, it follows that such impediments, if known, do not invalidate a marriage, but only when ignorance of them destroys voluntariness. Such impediments are slavery and impotence of coition. And, because they have of themselves the nature of an impediment, they are reckoned as special impediments besides error; whereas a change of person is not reckoned a special impediment besides error, because the substitution of another person has not the nature of an impediment except by reason of the intention of one of the contracting parties.

  Reply to Objection 5: Freedom does not hinder the marriage act, wherefore ignorance of freedom is no impediment to matrimony.

  Reply to Objection 6: Leprosy does not hinder marriage as to its first act, since lepers can pay the debt freely; although they lay a burden upon marriage as to its secondary effects; wherefore it is not an impediment to marriage as slavery is.

Article: 2 

Whether a slave can marry without his master's consent?

  Objection 1: It would seem that a slave cannot marry without his master's consent. For no one can give a person that which is another's without the latter's consent. Now a slave is his master's chattel. Therefore he cannot give his wife power over his body by marrying without his master's consent.

  Objection 2: Further, a slave is bound to obey his master. But his master may command him not to consent to marry. Therefore he cannot marry without his consent.

  Objection 3: Further, after marriage, a slave is bound even by a precept of the Divine law to pay the debt to his wife. But at the time that his wife asks for the debt his master may demand of him a service which he will be unable to perform if he wish to occupy himself in carnal intercourse. Therefore if a slave can marry without his master's consent, the latter would be deprived of a service due to him without any fault of his; and this ought not to be.

  Objection 4: Further, a master may sell his slave into a foreign country, where the latter's wife is unable to follow him, through either bodily weakness, or imminent danger to her faith; for instance if he be sold to unbelievers, or if her master be unwilling, supposing her to be a bondswoman; and thus the marriage will be dissolved, which is unfitting. Therefore a slave cannot marry without his master's consent.

  Objection 5: Further, the burden under which a man binds himself to the Divine service is more advantageous than that whereby a man subjects himself to his wife. But a slave cannot enter religion or receive orders without his master's consent. Much less therefore can he be married without his consent.

  On the contrary, "In Christ Jesus . . . there is neither bond nor free" (Gal. 3:26,28). Therefore both freeman and bondsman enjoy the same liberty to marry in the faith of Christ Jesus.

   Further, slavery is of positive law; whereas marriage is of natural and Divine law. Since then positive law is not prejudicial to the natural or the Divine law, it would seem that a slave can marry without his master's consent.

  I answer that, As stated above (Article [1], ad 3), the positive law arises out of the natural law, and consequently slavery, which is of positive law, cannot be prejudicious to those things that are of natural law. Now just as nature seeks the preservation of the individual, so does it seek the preservation of the species by means of procreation; wherefore even as a slave is not so subject to his master as not to be at liberty to eat, sleep, and do such things as pertain to the needs of his body, and without which nature cannot be preserved, so he is not subject to him to the extent of being unable to marry freely, even without his master's knowledge or consent.

  Reply to Objection 1: A slave is his master's chattel in matters superadded to nature, but in natural things all are equal. Wherefore, in things pertaining to natural acts, a slave can by marrying give another person power over his body without his master's consent.

  Reply to Objection 2: A slave is bound to obey his master in those things which his master can command lawfully; and just as his master cannot lawfully command him not to eat or sleep, so neither can he lawfully command him to refrain from marrying. For it is the concern of the lawgiver how each one uses his own, and consequently if the master command his slave not to marry, the slave is not bound to obey his master.

  Reply to Objection 3: If a slave has married with his master's consent, he should omit the service commanded by his master and pay the debt to his wife; because the master, by consenting to his slave's marriage, implicitly consented to all that marriage requires. If, however, the marriage was contracted without the master's knowledge or consent, he is not bound to pay the debt, but in preference to obey his master, if the two things are incompatible. Nevertheless in such matters there are many particulars to be considered, as in all human acts, namely the danger to which his wife's chastity is exposed, and the obstacle which the payment of the debt places in the way of the service commanded, and other like considerations, all of which being duly weighed it will be possible to judge which of the two in preference the slave is bound to obey, his master or his wife.

  Reply to Objection 4: In such a case it is said that the master should be compelled not to sell the slave in such a way as to increase the weight of the marriage burden, especially since he is able to obtain anywhere a just price for his slave.

  Reply to Objection 5: By entering religion or receiving orders a man is bound to the Divine service for all time; whereas a husband is bound to pay the debt to his wife not always, but at a fitting time; hence the comparison fails. Moreover, he who enters religion or receives orders binds himself to works that are superadded to natural works, and in which his master has power over him, but not in natural works to which a man binds himself by marriage. Hence he cannot vow continence without his master's consent.

Article: 3 

Whether slavery can supervene to marriage?

  Objection 1: It would seem that slavery cannot supervene to marriage, by the husband selling himself to another as slave. Because what is done by fraud and to another's detriment should not hold. But a husband who sells himself for a slave, does so sometimes to cheat marriage, and at least to the detriment of his wife. Therefore such a sale should not hold as to the effect of slavery.

  Objection 2: Further, two favorable things outweigh one that is not favorable. Now marriage and freedom are favorable things and are contrary to slavery, which in law is not a favorable thing. Therefore such a slavery ought to be entirely annulled in marriage.

  Objection 3: Further, in marriage husband and wife are on a par with one another. Now the wife cannot surrender herself to be a slave without her husband's consent. Therefore neither can the husband without his wife's consent.

  Objection 4: Further, in natural things that which hinders a thing being generated destroys it after it has been generated. Now bondage of the husband, if unknown to the wife, is an impediment to the act of marriage before it is performed. Therefore if it could supervene to marriage it would dissolve it; which is unreasonable.

  On the contrary, Everyone can give another that which is his own. Now the husband is his own master since he is free. Therefore he can surrender his right to another.

   Further, a slave can marry without his master's consent, as stated above (Article [2]). Therefore a husband can in like manner subject himself to a master, without his wife's consent.

  I answer that, A husband is subject to his wife in those things which pertain to the act of nature; in these things they are equal, and the subjection of slavery does not extend thereto. Wherefore the husband, without his wife's knowledge, can surrender himself to be another's slave. Nor does this result in a dissolution of the marriage, since no impediment supervening to marriage can dissolve it, as stated above (Question [50], Article [1], ad 7).

  Reply to Objection 1: The fraud can indeed hurt the person who has acted fraudulently, but it cannot be prejudicial to another person: wherefore if the husband, to cheat his wife, surrender himself to be another's slave, It will be to his own prejudice, through his losing the inestimable good of freedom; whereas this can nowise be prejudicial to the wife, and he is bound to pay her the debt when she asks, and to do all that marriage requires of him for he cannot be taken away from these obligations by his master's command.

  Reply to Objection 2: In so far as slavery is opposed to marriage, marriage is prejudicial to slavery, since the slave is bound then to pay the debt to his wife, though his master be unwilling.

  Reply to Objection 3: Although husband and wife are considered to be on a par in the marriage act and in things relating to nature, to which the condition of slavery does not extend, nevertheless as regards the management of the household, and other such additional matters the husband is the head of the wife and should correct her, and not "vice versa." Hence the wife cannot surrender herself to be a slave without her husband's consent.

  Reply to Objection 4: This argument considers corruptible things; and yet even in these there are many obstacles to generation that are not capable of destroying what is already generated. But in things which have stability it is possible to have an impediment which prevents a certain thing from beginning to be, yet does not cause it to cease to be; as instanced by the rational soul. It is the same with marriage, which is a lasting tie so long as this life lasts.
 
Article: 4 

Whether children should follow the condition of their father?

  Objection 1: It would seem that children should follow the condition of their father. Because dominion belongs to those of higher rank. Now in generating the father ranks above the mother. Therefore, etc.

  Objection 2: Further, the being of a thing depends on the form more than on the matter. Now in generation the father gives the form, and the mother the matter (De Gener. Animal. ii, 4). Therefore the child should follow the condition of the father rather than of the mother.

  Objection 3: Further, a thing should follow that chiefly to which it is most like. Now the son is more like the father than the mother, even as the daughter is more like the mother. Therefore at least the son should follow the father in preference, and the daughter the mother.

  Objection 4: Further, in Holy Writ genealogies are not traced through the women but through the men. Therefore the children follow the father rather than the mother.

  On the contrary, If a man sows on another's land, the produce belongs to the owner of the land. Now the woman's womb in relation to the seed of man is like the land in relation to the sower. Therefore, etc.

   Further, we observe that in animals born from different species the offspring follows the mother rather that the father, wherefore mules born of a mare and an ass are more like mares than those born of a she-ass and a horse. Therefore it should be the same with men.

  I answer that, According to civil law (XIX, ff. De statu hom. vii, cap. De rei vendit.) the offspring follows the womb: and this is reasonable since the offspring derives its formal complement from the father, but the substance of the body from the mother. Now slavery is a condition of the body, since a slave is to the master a kind of instrument in working; wherefore children follow the mother in freedom and bondage; whereas in matters pertaining to dignity as proceeding from a thing's form, they follow the father, for instance in honors, franchise, inheritance and so forth. The canons are in agreement with this (cap. Liberi, 32, qu. iv, in gloss.: cap. Inducens, De natis ex libero ventre) as also the law of Moses (Ex. 21).

   In some countries, however, where the civil law does not hold, the offspring follows the inferior condition, so that if the father be a slave the children will be slaves although the mother be free; but not if the father gave himself up as a slave after his marriage and without his wife's consent; and the same applies if the case be reversed. And if both be of servile condition and belong to different masters, the children, if several, are divided among the latter, or if one only, the one master will compensate the other in value and will take the child thus born for his slave. However it is incredible that this custom have as much reason in its favor as the decision of the time-honored deliberations of many wise men. Moreover in natural things it is the rule that what is received is in the recipient according to the mode of the recipient and not according to the mode of the giver; wherefore it is reasonable that the seed received by the mother should be drawn to her condition.

  Reply to Objection 1: Although the father is a more noble principle than the mother, nevertheless the mother provides the substance of the body, and it is to this that the condition of slavery attaches.

  Reply to Objection 2: As regards things pertaining to the specific nature the son is like the father rather than the mother, but in material conditions should be like the mother rather than the father, since a thing has its specific being from its form, but material conditions from matter.

  Reply to Objection 3: The son is like the father in respect of the form which is his, and also the father's, complement. Hence the argument is not to the point.

  Reply to Objection 4: It is because the son derives honor from his father rather than from his mother that in the genealogies of Scripture, and according to common custom, children are named after their father rather than from their mother. But in matters relating to slavery they follow the mother by preference.

Question: 53 OF THE IMPEDIMENT OF VOWS AND ORDERS (FOUR ARTICLES)

   We must now consider the impediment of vows and orders. Under this head there are four points of inquiry:

    (1) Whether a simple vow is a diriment impediment to matrimony?

    (2) Whether a solemn vow is a diriment impediment?

    (3) Whether order is an impediment to matrimony?

    (4) Whether a man can receive a sacred order after being married?

Article: 1 

Whether marriage already contracted should be annulled by the obligation of a simple vow?

  Objection 1: It would seem that a marriage already contracted ought to be annulled by the obligation of a simple vow. For the stronger tie takes precedence of the weaker. Now a vow is a stronger tie than marriage, since the latter binds man to man, but the former binds man to God. Therefore the obligation of a vow takes precedence of the marriage tie.

  Objection 2: Further, God's commandment is no less binding than the commandment of the Church. Now the commandment of the Church is so binding that a marriage is void if contracted in despite thereof; as instanced in the case of those who marry within the degrees of kindred forbidden by the Church. Therefore, since it is a Divine commandment to keep a vow, it would seem that if a person marry in despite of a vow his marriage should be annulled for that reason.

  Objection 3: Further, in marriage a man may have carnal intercourse without sin. Yet he who has taken a simple vow of chastity can never have carnal intercourse with his wife without sin. Therefore a simple vow annuls marriage. The minor is proved as follows. It is clear that it is a mortal sin to marry after taking a simple vow of continence, since according to Jerome [*Cf. St. Augustine, De Bono Viduit, ix] "for those who vow virginity it is damnable not only to marry, but even to wish to marry." Now the marriage contract is not contrary to the vow of continence, except by reason of carnal intercourse: and therefore he sins mortally the first time he has intercourse with his wife, and for the same reason every other time, because a sin committed in the first instance cannot be an excuse for a subsequent sin.

  Objection 4: Further, husband and wife should be equal in marriage, especially as regards carnal intercourse. But he who has taken a simple vow of continence can never ask for the debt without a sin, for this is clearly against his vow of continence, since he is bound to continence by vow. Therefore neither can he pay the debt without sin.

  On the contrary, Pope Clement [*Alexander III] says (cap. Consuluit, De his qui cler. vel vovent.) that a "simple vow is an impediment to the contract of marriage, but does not annul it after it is contracted."

  I answer that, A thing ceases to be in one man's power from the fact that it passes into the power of another. Now the promise of a thing does not transfer it into the power of the person to whom it is promised, wherefore a thing does not cease to be in a person's power for the reason that he has promised it. Since then a simple vow contains merely a simple promise of one's body to the effect of keeping continence for God's sake, a man still retains power over his own body after a simple vow, and consequently can surrender it to another, namely his wife; and in this surrender consists the sacrament of matrimony, which is indissoluble. Therefore although a simple vow is an impediment to the contracting of a marriage, since it is a sin to marry after taking a simple vow of continence, yet since the contract is valid, the marriage cannot be annulled on that account.

  Reply to Objection 1: A vow is a stronger tie than matrimony, as regards that to which man is tied, and the obligation under which he lies. because by marriage a man is tied to his wife, with the obligation of paying the debt, whereas by a vow a man is tied to God, with the obligation of remaining continent. But as to the manner in which he is tied marriage is a stronger tie than a simple vow, since by marriage a man surrenders himself actually to the power of his wife, but not by a simple vow as explained above: and the possessor is always in the stronger position. In this respect a simple vow binds in the same way as a betrothal; wherefore a betrothal must be annulled on account of a simple vow.

  Reply to Objection 2: The contracting of a marriage between blood relations is annulled by the commandment forbidding such marriages, not precisely because it is a commandment of God or of the Church, but because it makes it impossible for the body of a kinswoman to be transferred into the power of her kinsman: whereas the commandment forbidding marriage after a simple vow has not this effect, as already stated. Hence the argument is void for it assigns as a cause that which is not cause.

  Reply to Objection 3: If after taking a simple vow a man contract marriage by words of the present, he cannot know his wife without mortal sin, because until the marriage is consummated he is still in a position to fulfill the vow of continence. But after the marriage has been consummated, thenceforth through his fault it is unlawful for him not to pay the debt when his wife asks: wherefore this is not covered by his obligation to his vow, as explained above (ad 1). Nevertheless he should atone for not keeping continence, by his tears of repentance.

  Reply to Objection 4: After contracting marriage he is still bound to keep his vow of continence in those matters wherein he is not rendered unable to do so. Hence if his wife die he is bound to continence altogether. And since the marriage tie does not bind him to ask for the debt, he cannot ask for it without sin, although he can pay the debt without sin on being asked, when once he has incurred this obligation through the carnal intercourse that has already occurred. And this holds whether the wife ask expressly or interpretively, as when she is ashamed and her husband feels that she desires him to pay the debt, for then he may pay it without sin. This is especially the case if he fears to endanger her chastity: nor does it matter that they are equal in the marriage act, since everyone may renounce what is his own. Some say, however, that he may both ask and pay lest the marriage become too burdensome to the wife who has always to ask; but if this be looked into aright, it is the same as asking interpretively.
 
Article: 2 

Whether a solemn vow dissolves a marriage already contracted?

  Objection 1: It would seem that not even a solemn vow dissolves a marriage already contracted. For according to a Decretal (cap. Rursus, De his qui cler. vel vovent.) "in God's sight a simple vow is no less binding than a solemn one." Now marriage stands or falls by virtue of the Divine acceptance. Therefore since a simple vow does not dissolve marriage, neither will a solemn vow dissolve it.

  Objection 2: Further, a solemn vow does not add the same force to a simple vow as an oath does. Now a simple vow, even though an oath be added thereto, does not dissolve a marriage already contracted. Neither therefore does a solemn vow.

  Objection 3: Further, a solemn vow has nothing that a simple vow cannot have. For a simple vow may give rise to scandal since it may be public, even as a solemn vow. Again the Church could and should ordain that a simple vow dissolves a marriage already contracted, so that many sins may be avoided. Therefore for the same reason that a simple vow does not dissolve a marriage already contracted, neither should a solemn vow dissolve it.

  On the contrary, He who takes a solemn vow contracts a spiritual marriage with God, which is much more excellent than a material marriage. Now a material marriage already contracted annuls a marriage contracted afterwards. Therefore a solemn vow does also.

   Further, the same conclusion may be proved by many authorities quoted in the text (Sent. iv, D, 28).

  I answer that, All agree that as a solemn vow is an impediment to the contracting of marriage, so it invalidates the contract. Some assign scandal as the reason. But this is futile, because even a simple vow sometimes leads to scandal since it is at times somewhat public. Moreover the indissolubility of marriage belongs to the truth of life [*Cf. FP, Question [16], Article [4], ad 3; FP, Question [21], Article [2], ad 2; SS, Question [109], Article [3], ad 3], which truth is not to be set aside on account of scandal. Wherefore others say that it is on account of the ordinance of the Church. But this again is insufficient, since in that case the Church might decide the contrary, which is seemingly untrue. Wherefore we must say with others that a solemn vow of its very nature dissolves the marriage contract, inasmuch namely as thereby a man has lost the power over his own body, through surrendering it to God for the purpose of perpetual continence. Wherefore he is unable to surrender it to the power of a wife by contracting marriage. And since the marriage that follows such a vow is void, a vow of this kind is said to annul the marriage contracted.

  Reply to Objection 1: A simple vow is said to be no less binding in God's sight than a solemn vow, in matters pertaining to God, for instance the separation from God by mortal sin, because he who breaks a simple vow commits a mortal sin just as one who breaks a solemn vow, although it is more grievous to break a solemn vow, so that the comparison be understood as to the genus and not as to the definite degree of guilt. But as regards marriage, whereby one man is under an obligation to another, there is no need for it to be of equal obligation even in general, since a solemn vow binds to certain things to which a simple vow does not bind.

  Reply to Objection 2: An oath is more binding than a vow on the part of the cause of the obligation: but a solemn vow is more binding as to the manner in which it binds, in so far as it is an actual surrender of that which is promised; while an oath does not do this actually. Hence the conclusion does not follow.

  Reply to Objection 3: A solemn vow implies the actual surrender of one's body, whereas a simple vow does not, as stated above (Article [1]). Hence the argument does not suffice to prove the conclusion.
 
Article: 3 

Whether order is an impediment to matrimony?

  Objection 1: It would seem that order is not an impediment to matrimony. For nothing is an impediment to a thing except its contrary. But order is not contrary to matrimony. Therefore it is not an impediment thereto.

  Objection 2: Further, orders are the same with us as with the Eastern Church. But they are not an impediment to matrimony in the Eastern Church. Therefore, etc.

  Objection 3: Further, matrimony signifies the union of Christ with the Church. Now this is most fittingly signified in those who are Christ's ministers, those namely who are ordained. Therefore order is not an impediment to matrimony.

  Objection 4: Further, all the orders are directed to spiritual things. Now order cannot be an impediment to matrimony except by reason of its spirituality. Therefore if order is an impediment to matrimony, every order will be an impediment, and this is untrue.

  Objection 5: Further, every ordained person can have ecclesiastical benefices, and can enjoy equally the privilege of clergy. If, therefore, orders are an impediment to marriage, because married persons cannot have an ecclesiastical benefice, nor enjoy the privilege of clergy, as jurists assert (cap. Joannes et seqq., De cler. conjug.), then every order ought to be an impediment. Yet this is false, as shown by the Decretal of Alexander III (De cler. conjug., cap. Si Quis): and consequently it would seem that no order is an impediment to marriage.

  On the contrary, the Decretal says (De cler. conjug., cap. Si Quis): "any person whom you shall find to have taken a wife after receiving the subdiaconate or the higher orders, you shall compel to put his wife away." But this would not be so if the marriage were valid.

   Further, no person who has vowed continence can contract marriage. Now some orders have a vow of continence connected with them, as appears from the text (Sent. iv, D, 37). Therefore in that case order is an impediment to matrimony.

  I answer that, By a certain fittingness the very nature of holy order requires that it should be an impediment to marriage: because those who are in holy orders handle the sacred vessels and the sacraments: wherefore it is becoming that they keep their bodies clean by continence [*Cf. Is. 52:11]. But it is owing to the Church's ordinance that it is actually an impediment to marriage. However it is not the same with the Latins as with the Greeks; since with the Greeks it is an impediment to the contracting of marriage, solely by virtue of order; whereas with the Latins it is an impediment by virtue of order, and besides by virtue of the vow of continence which is annexed to the sacred orders; for although this vow is not expressed in words, nevertheless a person is understood to have taken it by the very fact of his being ordained. Hence among the Greeks and other Eastern peoples a sacred order is an impediment to the contracting of matrimony but it does not forbid the use of marriage already contracted: for they can use marriage contracted previously, although they cannot be married again. But in the Western Church it is an impediment both to marriage and to the use of marriage, unless perhaps the husband should receive a sacred order without the knowledge or consent of his wife, because this cannot be prejudicial to her.

   Of the distinction between sacred and non-sacred orders now and in the early Church we have spoken above (Question [37], Article [3]).

  Reply to Objection 1: Although a sacred order is not contrary to matrimony as a sacrament, it has a certain incompatibility with marriage in respect of the latter's act which is an obstacle to spiritual acts.

  Reply to Objection 2: The objection is based on a false statement: since order is everywhere an impediment to the contracting of marriage, although it has not everywhere a vow annexed to it.

  Reply to Objection 3: Those who are in sacred orders signify Christ by more sublime actions, as appears from what has been said in the treatise on orders (Question [37], Articles [2],4), than those who are married. Consequently the conclusion does not follow.

  Reply to Objection 4: Those who are in minor orders are not forbidden to marry by virtue of their order; for although those orders are entrusted with certain spiritualities, they are not admitted to the immediate handling of sacred things, as those are who are in sacred orders. But according to the laws of the Western Church, the use of marriage is an impediment to the exercise of a non-sacred order, for the sake of maintaining a greater honesty in the offices of the Church. And since the holding of an ecclesiastical benefice binds a man to the exercise of his order, and since for this very reason he enjoys the privilege of clergy, it follows that in the Latin Church this privilege is forfeit to a married cleric.

   This suffices for the Reply to the last Objection.
 
Article: 4 

Whether a sacred order cannot supervene to matrimony?

  Objection 1: It would seem that a sacred order cannot supervene to matrimony. For the stronger prejudices the weaker. Now a spiritual obligation is stronger than a bodily tie. Therefore if a married man be ordained, this will prejudice the wife, so that she will be unable to demand the debt, since order is a spiritual, and marriage a bodily bond. Hence it would seem that a man cannot receive a sacred order after consummating marriage.

  Objection 2: Further, after consummating the marriage, one of the parties cannot vow continence without the other's consent [*Cf. Question [61], Article [1]]. Now a sacred order has a vow of continence annexed to it. Therefore if the husband be ordained without his wife's consent, she will be bound to remain continent against her will, since she cannot marry another man during her husband's lifetime.

  Objection 3: Further, a husband may not even for a time devote himself to prayer without his wife's consent (1 Cor. 7:5). But in the Eastern Church those who are in sacred orders are bound to continence for the time when they exercise their office. Therefore neither may they be ordained without their wife's consent, and much less may the Latins.

  Objection 4: Further, husband and wife are on a par with one another. Now a Greek priest cannot marry again after his wife's death. Therefore neither can his wife after her husband's death. But she cannot be deprived by her husband's act of the right to marry after his death. Therefore her husband cannot receive orders after marriage.

  Objection 5: Further, order is as much opposed to marriage as marriage to order. Now a previous order is an impediment to a subsequent marriage. Therefore, etc.

  On the contrary, Religious are bound to continence like those who are in sacred orders. But a man may enter religion after marriage, if his wife die, or if she consent. Therefore he can also receive orders.

   Further, a man may become a man's bondsman after marriage. Therefore he can become a bondsman of God by receiving orders.

  I answer that, Marriage is not an impediment to the receiving of sacred orders, since if a married man receive sacred orders, even though his wife be unwilling, he receives the character of order: but he lacks the exercise of his order. If, however, his wife consent, or if she be dead, he receives both the order and the exercise.

  Reply to Objection 1: The bond of orders dissolves the bond of marriage as regards the payment of the debt, in respect of which it is incompatible with marriage, on the part of the person ordained, since he cannot demand the debt, nor is the wife bound to pay it. But it does not dissolve the bond in respect of the other party, since the husband is bound to pay the debt to the wife if he cannot persuade her to observe continence.

  Reply to Objection 2: If the husband receive sacred orders with the knowledge and consent of his wife, she is bound to vow perpetual continence, but she is not bound to enter religion, if she has no fear of her chastity being endangered through her husband having taken a solemn vow: it would have been different, however, if he had taken a simple vow. On the other hand, if he be ordained without her consent, she is not bound in this way, because the result is not prejudicial to her in any way.

  Reply to Objection 3: It would seem more probable, although some say the contrary, that even a Greek ought not to receive sacred orders without his wife's consent, since at least at the time of his ministry she would be deprived of the payment of the debt, of which she cannot be deprived according to law if the husband should have been ordained without her consent or knowledge.

  Reply to Objection 4: As stated, among the Greeks the wife, by the very fact of consenting to her husband's receiving a sacred order, binds herself never to marry another man, because the signification of marriage would not be safeguarded, and this is especially required in the marriage of a priest. If, however, he be ordained without her consent, seemingly she would not be under that obligation.

  Reply to Objection 5: Marriage has for its cause our consent: not so order, which has a sacramental cause appointed by God. Hence matrimony may be impeded by a previous order; so as not to be true marriage: whereas order cannot be impeded by marriage, so as not to be true order, because the power of the sacraments is unchangeable, whereas human acts can be impeded.

Question: 54 OF THE IMPEDIMENT OF CONSANGUINITY (FOUR ARTICLES)

   We must next consider the impediment of consanguinity. Under this head there are four points of inquiry:

    (1) Whether consanguinity is rightly defined by some?

    (2) Whether it is fittingly distinguished by degrees and lines?

    (3) Whether certain degrees are by natural law an impediment to marriage?

    (4) Whether the impediment degrees can be fixed by the ordinance of the Church?
 
Article: 1

Whether consanguinity is rightly defined?

  Objection 1: It would seem that consanguinity is unsuitably defined by some as follows: "Consanguinity is the tie contracted between persons descending from the same common ancestor by carnal procreation." For all men descend from the same common ancestor, namely Adam, by carnal procreation. Therefore if the above definition of consanguinity is right, all men would be related by consanguinity: which is false.

  Objection 2: Further, a tie is only between things in accord with one another, since a tie unites. Now there is not greater accordance between persons descended from a common ancestor than there is between other men, since they accord in species but differ in number, just as other men do. Therefore consanguinity is not a tie.

  Objection 3: Further, carnal procreation, according to the Philosopher (De Gener. Anim. ii, 19), is effected from the surplus food [*Cf. FP, Question [119], Article [2]]. Now this surplus has more in common with that which is eaten, since it agrees with it in substance, than with him who eats. Since then no tie of consanguinity arises between the person born of semen and that which he eats, neither will there be any tie of kindred between him and the person of whom he is born by carnal procreation.

  Objection 4: Further, Laban said to Jacob (Gn. 29:14): "Thou art my bone and my flesh," on account of the relationship between them. Therefore such a kinship should be called flesh-relationship rather than blood-relationship [consanguinitas].

  Objection 5: Further, carnal procreation is common to men and animals. But no tie of consanguinity is contracted among animals from carnal procreation. Therefore neither is there among men.

  I answer that, According to the Philosopher (Ethic. iii, 11, 12) "all friendship is based on some kind of fellowship." And since friendship is a knot or union, it follows that the fellowship which is the cause of friendship is called "a tie." Wherefore in respect of any kind of a fellowship certain persons are denominated as though they were tied together: thus we speak of fellow-citizens who are connected by a common political life, of fellow-soldiers who are connected by the common business of soldiering, and in the same way those who are connected by the fellowship of nature are said to be tied by blood [consanguinei]. Hence in the above definition "tie" is included as being the genus of consanguinity; the "persons descending from the same common ancestor," who are thus tied together are the subject of this tie. while "carnal procreation" is mentioned as being its origin.

  Reply to Objection 1: An active force is not received into an instrument in the same degree of perfection as it has in the principal agent. And since every moved mover is an instrument, it follows that the power of the first mover in a particular genus when drawn out through many mediate movers fails at length, and reaches something that is moved and not a mover. But the power of a begetter moves not only as to that which belongs to the species, but also as to that which belongs to the individual, by reason of which the child is like the parent even in accidentals and not only in the specific nature. And yet this individual power of the father is not so perfect in the son as it was in the father, and still less so in the grandson, and thus it goes on failing: so that at length it ceases and can go no further. Since then consanguinity results from this power being communicated to many through being conveyed to them from one person by procreation, it destroys itself by little and little, as Isidore says (Etym. ix). Consequently in defining consanguinity we must not take a remote common ancestor but the nearest, whose power still remains in those who are descended from him.

  Reply to Objection 2: It is clear from what has been said that blood relations agree not only in the specific nature but also in that power peculiar to the individual which is conveyed from one to many: the result being that sometimes the child is not only like his father, but also his grandfather or his remote ancestors (De Gener. Anim. iv, 3).

  Reply to Objection 3: Likeness depends more on form whereby a thing is actually, than on matter whereby a thing is potentially: for instance, charcoal has more in common with fire than with the tree from which the wood was cut. In like manner food already transformed by the nutritive power into the substance of the person fed has more in common with the subject nourished than with that from which the nourishment was taken. The argument however would hold according to the opinion of those who asserted that the whole nature of a thing is from its matter and that all forms are accidents: which is false.

  Reply to Objection 4: It is the blood that is proximately changed into the semen, as proved in De Gener. Anim. i, 18. Hence the tie contracted by carnal procreation is more fittingly called blood-relationship than flesh-relationship. That sometimes one relation is called the flesh of another, is because the blood which is transformed into the man's seed or into the menstrual fluid is potentially flesh and bone.

  Reply to Objection 5: Some say that the reason why the tie of consanguinity is contracted among men through carnal procreation, and not among other animals, is because whatever belongs to the truth of human nature in all men was in our first parent: which does not apply to other animals. But according to this, matrimonial consanguinity would never come to an end. However the above theory was disproved in the Second Book (Sent. ii, D, 30: FP, Question [119], Article [1]). Wherefore we must reply that the reason for this is that animals are not united together in the union of friendship through the begetting of many from one proximate parent, as is the case with men, as stated above.
 
Article: 2 

Whether consanguinity is fittingly distinguished by degrees and lines?

  Objection 1: It would seem that consanguinity is unfittingly distinguished by degrees and lines. For a line of consanguinity is described as "the ordered series of persons related by blood, and descending from a common ancestor in various degrees." Now consanguinity is nothing else but a series of such persons. Therefore a line of consanguinity is the same as consanguinity. Now a thing ought not to be distinguished by itself. Therefore consanguinity is not fittingly distinguished into lines.

  Objection 2: Further, that by which a common thing is divided should not be placed in the definition of that common thing. Now descent is placed in the above definition of consanguinity. Therefore consanguinity cannot be divided into ascending, descending and collateral lines.

  Objection 3: Further, a line is defined as being between two points. But two points make but one degree. Therefore one line has but one degree, and for this reason it would seem that consanguinity should not be divided into lines and degrees.

  Objection 4: Further, a degree is defined as "the relation between distant persons, whereby is known the distance between them." Now since consanguinity is a kind of propinquity, distance between persons is opposed to consanguinity rather than a part thereof.

  Objection 5: Further, if consanguinity is distinguished and known by its degrees, those who are in the same degree ought to be equally related. But this is false since a man's great-uncle and great-nephew are in the same degree, and yet they are not equally related according to a Decretal (cap. Porro; cap. Parenteloe, 35, qu. v). Therefore consanguinity is not rightly divided into degrees.

  Objection 6: Further, in ordinary things a different degree results from the addition of one thing to another, even as every additional unity makes a different species of number. Yet the addition of one person to another does not always make a different degree of consanguinity, since father and uncle are in the same degree of consanguinity, for they are side by side. Therefore consanguinity is not rightly divided into degrees.

  Objection 7: Further, if two persons be akin to one another there is always the same measure of kinship between them, since the distance from one extreme to the other is the same either way. Yet the degrees of consanguinity are not always the same on either side, since sometimes one relative is in the third and the other in the fourth degree. Therefore the measure of consanguinity cannot be sufficiently known by its degrees.

  I answer that, Consanguinity as stated (Article [1]) is a certain propinquity based on the natural communication by the act of procreation whereby nature is propagated. Wherefore according to the Philosopher (Ethic. viii, 12) this communication is threefold. one corresponds to the relationship between cause and effect, and this is the consanguinity of father to son, wherefore he says that "parents love their children as being a part of themselves." Another corresponds to the relation of effect to cause, and this is the consanguinity of son to father, wherefore he says that "children love their parents as being themselves something which owes its existence to them." The third corresponds to the mutual relation between things that come from the same cause, as brothers, "who are born of the same parents," as he again says (Ethic. viii, 12). And since the movement of a point makes a line, and since a father by procreation may be said to descend to his son, hence it is that corresponding to these three relationships there are three lines of consanguinity, namely the "descending" line corresponding to the first relationship, the "ascending" line corresponding to the second, and the "collateral" line corresponding to the third. Since however the movement of propagation does not rest in one term but continues beyond, the result is that one can point to the father's father and to the son's son, and so on, and according to the various steps we take we find various degrees in one line. And seeing that the degrees of a thing are parts of that thing, there cannot be degrees of propinquity where there is no propinquity. Consequently identity and too great a distance do away with degrees of consanguinity; since no man is kin to himself any more than he is like himself: for which reason there is no degree of consanguinity where there is but one person, but only when one person is compared to another.

   Nevertheless there are different ways of counting the degrees in various lines. For the degree of consanguinity in the ascending and descending line is contracted from the fact that one of the parties whose consanguinity is in question, is descended from the other. Wherefore according to the canonical as well as the legal reckoning, the person who occupies the first place, whether in the ascending or in the descending line, is distant from a certain one, say Peter, in the first degree---for instance father and son; while the one who occupies the second place in either direction is distant in the second degree, for instance grandfather, grandson and so on. But the consanguinity that exists between persons who are in collateral lines is contracted not through one being descended from the other, but through both being descended from one: wherefore the degrees of consanguinity in this line must be reckoned in relation to the one principle whence it arises. Here, however, the canonical and legal reckonings differ: for the legal reckoning takes into account the descent from the common stock on both sides, whereas the canonical reckoning takes into account only one, that namely on which the greater number of degrees are found. Hence according to the legal reckoning brother and sister, or two brothers, are related in the second degree, because each is separated from the common stock by one degree; and in like manner the children of two brothers are distant from one another in the fourth degree. But according to the canonical reckoning, two brothers are related in the first degree, since neither is distant more than one degree from the common stock: but the children of one brother are distant in the second degree from the other brother, because they are at that distance from the common stock. Hence, according to the canonical reckoning, by whatever degree a person is distant from some higher degree, by so much and never by less is he distant from each person descending from that degree, because "the cause of a thing being so is yet more so." Wherefore although the other descendants from the common stock be related to some person on account of his being descended from the common stock, these descendants of the other branch cannot be more nearly related to him than he is to the common stock. Sometimes, however, a person is more distantly related to a descendant from the common stock, than he himself is to the common stock, because this other person may be more distantly related to the common stock than he is: and consanguinity must be reckoned according to the more distant degree.

  Reply to Objection 1: This objection is based on a false premise: for consanguinity is not the series but a mutual relationship existing between certain persons, the series of whom forms a line of consanguinity.

  Reply to Objection 2: Descent taken in a general sense attaches to every line of consanguinity, because carnal procreation whence the tie of consanguinity arises is a kind of descent: but it is a particular kind of descent, namely from the person whose consanguinity is in question, that makes the descending line.

  Reply to Objection 3: A line may be taken in two ways. Sometimes it is taken properly for the dimension itself that is the first species of continuous quantity: and thus a straight line contains actually but two points which terminate it, but infinite points potentially, any one of which being actually designated, the line is divided, and becomes two lines. But sometimes a line designates things which are arranged in a line, and thus we have line and figure in numbers, in so far as unity added to unity involves number. Thus every unity added makes a degree in a particular line: and it is the same with the line of consanguinity: wherefore one line contains several degrees.

  Reply to Objection 4: Even as there cannot be likeness without a difference, so there is no propinquity without distance. Hence not every distance is opposed to consanguinity, but such as excludes the propinquity of blood-relationship.

  Reply to Objection 5: Even as whiteness is said to be greater in two ways, in one way through intensity of the quality itself, in another way through the quantity of the surface, so consanguinity is said to be greater or lesser in two ways. First, intensively by reason of the very nature of consanguinity: secondly, extensively as it were, and thus the degree of consanguinity is measured by the persons between whom there is the propagation of a common blood, and in this way the degrees of consanguinity are distinguished. Wherefore it happens that of two persons related to one person in the same degree of consanguinity, one is more akin to him than the other, if we consider the quantity of consanguinity in the first way: thus a man's father and brother are related to him in the first degree of consanguinity, because in neither case does any person come in between; and yet from the point of view of intensity a man's father is more closely related to him than his brother, since his brother is related to him only because he is of the same father. Hence the nearer a person is to the common ancestor from whom the consanguinity descends, the greater is his consanguinity although he be not in a nearer degree. In this way a man's great-uncle is more closely related to him than his great-nephew, although they are in the same degree.

  Reply to Objection 6: Although a man's father and uncle are in the same degree in respect of the root of consanguinity, since both are separated by one degree from the grandfather, nevertheless in respect of the person whose consanguinity is in question, they are not in the same degree, since the father is in the first degree, whereas the uncle cannot be nearer than the second degree, wherein the grandfather stands.

  Reply to Objection 7: Two persons are always related in the same degree to one another, although they are not always distant in the same number of degrees from the common ancestor, as explained above.

Article: 3 

Whether consanguinity is an impediment to marriage by virtue of the natural law?

  Objection 1: It would seem that consanguinity is not by natural law an impediment to marriage. For no woman can be more akin to a man than Eve was to Adam, since of her did he say (Gn. 2:23): "This now is bone of my bones and flesh of my flesh." Yet Eve was joined in marriage to Adam. Therefore as regards the natural law no consanguinity is an impediment to marriage.

  Objection 2: Further, the natural law is the same for all. Now among the uncivilized nations no person is debarred from marriage by reason of consanguinity. Therefore, as regards the law of nature, consanguinity is no impediment to marriage.

  Objection 3: Further, the natural law is what "nature has taught all animals," as stated at the beginning of the Digests (i, ff. De just. et jure). Now brute animals copulate even with their mother. Therefore it is not of natural law that certain persons are debarred from marriage on account of consanguinity.

  Objection 4: Further, nothing that is not contrary to one of the goods of matrimony is an impediment to marriage. But consanguinity is not contrary to any of the goods of marriage. Therefore it is not an impediment thereto.

  Objection 5: Further, things which are more akin and more similar to one another are better and more firmly united together. Now matrimony is a kind of union. Since then consanguinity is a kind of kinship, it does not hinder marriage but rather strengthens the union.

  On the contrary, According to the natural law whatever is an obstacle to the good of the offspring is an impediment to marriage. Now consanguinity hinders the good of the offspring, because in the words of Gregory (Regist., epis. xxxi) quoted in the text (Sent. iv, D, 40): "We have learnt by experience that the children of such a union cannot thrive." Therefore according to the law of nature consanguinity is an impediment to matrimony.

   Further, that which belongs to human nature when it was first created is of natural law. Now it belonged to human nature from when it was first created that one should be debarred from marrying one's father or mother: in proof of which it was said (Gn. 2:24): "Wherefore a man shall leave father and mother": which cannot be understood of cohabitation, and consequently must refer to the union of marriage. Therefore consanguinity is an impediment to marriage according to the natural law.

  I answer that, In relation to marriage a thing is said to be contrary to the natural law if it prevents marriage from reaching the end for which it was instituted. Now the essential and primary end of marriage is the good of the offspring. and this is hindered by a certain consanguinity, namely that which is between father and daughter, or son and mother. It is not that the good of the offspring is utterly destroyed, since a daughter can have a child of her father's semen and with the father rear and teach that child in which things the good of the offspring consists, but that it is not effected in a becoming way. For it is out of order that a daughter be mated to her father in marriage for the purpose of begetting and rearing children, since in all things she ought to be subject to her father as proceeding from him. Hence by natural law a father and mother are debarred from marrying their children; and the mother still more than the father, since it is more derogatory to the reverence due to parents if the son marry his mother than if the father marry his daughter; since the wife should be to a certain extent subject to her husband. The secondary essential end of marriage is the curbing of concupiscence; and this end would be forfeit if a man could marry any blood-relation, since a wide scope would be afforded to concupiscence if those who have to live together in the same house were not forbidden to be mated in the flesh. Wherefore the Divine law debars from marriage not only father and mother, but also other kinsfolk who have to live in close intimacy with one another and ought to safeguard one another's modesty. The Divine law assigns this reason (Lev. 18:10): "Thou shalt not uncover the nakedness" of such and such a one, "because it is thy own nakedness."

   But the accidental end of marriage is the binding together of mankind and the extension of friendship: for a husband regards his wife's kindred as his own. Hence it would be prejudicial to this extension of friendship if a man could take a woman of his kindred to wife since no new friendship would accrue to anyone from such a marriage. Wherefore, according to human law and the ordinances of the Church, several degrees of consanguinity are debarred from marriage.

   Accordingly it is clear from what has been said that consanguinity is by natural law an impediment to marriage in regard to certain persons, by Divine law in respect of some, and by human law in respect of others.

  Reply to Objection 1: Although Eve was formed from Adam she was not Adam's daughter, because she was not formed from him after the manner in which it is natural for a man to beget his like in species, but by the Divine operation, since from Adam's rib a horse might have been formed in the same way as Eve was. Hence the natural connection between Eve and Adam was not so great as between daughter and father, nor was Adam the natural principle of Eve as a father is of his daughter.

  Reply to Objection 2: That certain barbarians are united carnally to their parents does not come from the natural law but from the passion of concupiscence which has clouded the natural law in them.

  Reply to Objection 3: Union of male and female is said to be of natural law, because nature has taught this to animals: yet she has taught this union to various animals in various ways according to their various conditions. But carnal copulation with parents is derogatory to the reverence due to them. For just as nature has instilled into parents solicitude in providing for their offspring, so has it instilled into the offspring reverence towards their parents: yet to no kind of animal save man has she instilled a lasting solicitude for his children or reverence for parents; but to other animals more or less, according as the offspring is more or less necessary to its parents, or the parents to their offspring. Hence as the Philosopher attests (De Animal. ix, 47) concerning the camel and the horse, among certain animals the son abhors copulation with its mother as long as he retains knowledge of her and a certain reverence for her. And since all honest customs of animals are united together in man naturally, and more perfectly than in other animals, it follows that man naturally abhors carnal knowledge not only of his mother, but also of his daughter, which is, however, less against nature, as stated above.

   Moreover consanguinity does not result from carnal procreation in other animals as in man, as stated above (Article [1], ad 5). Hence the comparison fails.

  Reply to Objection 4: It has been shown how consanguinity between married persons is contrary to the goods of marriage. Hence the Objection proceeds from false premises.

  Reply to Objection 5: It is not unreasonable for one of two unions to be hindered by the other, even as where there is identity there is not likeness. In like manner the tie of consanguinity may hinder the union of marriage.

Article: 4 

Whether the degrees of consanguinity that are an impediment to marriage could be fixed by the Church?

  Objection 1: It would seem that the degrees of consanguinity that are an impediment to marriage could not be fixed by the Church so as to reach to the fourth degree. For it is written (Mt. 19:6): "What God hath joined together let no man put asunder." But God joined those together who are married within the fourth degree of consanguinity, since their union is not forbidden by the Divine law. Therefore they should not be put asunder by a human law.

  Objection 2: Further, matrimony is a sacrament as also is baptism. Now no ordinance of the Church could prevent one who is baptized from receiving the baptismal character, if he be capable of receiving it according to the Divine law. Therefore neither can an ordinance of the Church forbid marriage between those who are not forbidden to marry by the Divine law.

  Objection 3: Further, positive law can neither void nor extend those things which are natural. Now consanguinity is a natural tie which is in itself of a nature to impede marriage. Therefore the Church cannot by its ordinance permit or forbid certain people to marry, any more than she can make them to be kin or not kin.

  Objection 4: Further, an ordinance of positive law should have some reasonable cause, since it is for this reasonable cause that it proceeds from the natural law. But the causes that are assigned for the number of degrees seem altogether unreasonable, since they bear no relation to their effect; for instance, that consanguinity be an impediment as far as the fourth degree on account of the four elements as far as the sixth degree on account of the six ages of the world, as far as the seventh degree on account of the seven days of which all time is comprised. Therefore seemingly this prohibition is of no force.

  Objection 5: Further, where the cause is the same there should be the same effect. Now the causes for which consanguinity is an impediment to marriage are the good of the offspring, the curbing of concupiscence, and the extension of friendship, as stated above (Article [3]), which are equally necessary for all time. Therefore the degrees of consanguinity should have equally impeded marriage at all times: yet this is not true since consanguinity is now an impediment to marriage as far as the fourth degree, whereas formerly it was an impediment as far as the seventh.

  Objection 6: Further, one and the same union cannot be a kind of sacrament and a kind of incest. But this would be the case if the Church had the power of fixing a different number in the degrees which are an impediment to marriage. Thus if certain parties related in the fifth degree were married when that degree was an impediment, their union would be incestuous, and yet this same union would be a marriage afterwards when the Church withdrew her prohibition. And the reverse might happen if certain degrees which were not an impediment were subsequently to be forbidden by the Church. Therefore seemingly the power of the Church does not extend to this.

  Objection 7: Further, human law should copy the Divine law. Now according to the Divine law which is contained in the Old Law, the prohibition of degrees does not apply equally in the ascending and descending lines: since in the Old Law a man was forbidden to marry his father's sister but not his brother's daughter. Therefore neither should there remain now a prohibition in respect of nephews and uncles.

  On the contrary, Our Lord said to His disciples (Lk. 10:16): "He that heareth you heareth Me." Therefore a commandment of the Church has the same force as a commandment of God. Now the Church sometimes has forbidden and sometimes allowed certain degrees which the Old Law did not forbid. Therefore those degrees are an impediment to marriage.

   Further, even as of old the marriages of pagans were controlled by the civil law, so now is marriage controlled by the laws of the Church. Now formerly the civil law decided which degrees of consanguinity impede marriage, and which do not. Therefore this can be done now by a commandment of the Church.

  I answer that, The degrees within which consanguinity has been an impediment to marriage have varied according to various times. For at the beginning of the human race father and mother alone were debarred from marrying their children, because then mankind were few in number, and then it was necessary for the propagation of the human race to be ensured with very great care, and consequently only such persons were to be debarred as were unfitted for marriage even in respect of its principal end which is the good of the offspring, as stated above (Article [3]). Afterwards however, the human race having multiplied, more persons were excluded by the law of Moses, for they already began to curb concupiscence. Wherefore as Rabbi Moses says (Doc. Perp. iii, 49) all those persons were debarred from marrying one another who are wont to live together in one household, because if a lawful carnal intercourse were possible between them, this would prove a very great incentive to lust. Yet the Old Law permitted other degrees of consanguinity, in fact to a certain extent it commanded them; to wit that each man should take a wife from his kindred, in order to avoid confusion of inheritances: because at that time the Divine worship was handed down as the inheritance of the race. But afterwards more degrees were forbidden by the New Law which is the law of the spirit and of love, because the worship of God is no longer handed down and spread abroad by a carnal birth but by a spiritual grace: wherefore it was necessary that men should be yet more withdrawn from carnal things by devoting themselves to things spiritual, and that love should have a yet wider play. Hence in olden times marriage was forbidden even within the more remote degrees of consanguinity, in order that consanguinity and affinity might be the sources of a wider natural friendship; and this was reasonably extended to the seventh degree, both because beyond this it was difficult to have any recollection of the common stock, and because this was in keeping with the sevenfold grace of the Holy Ghost. Afterwards, however, towards these latter times the prohibition of the Church has been restricted to the fourth degree, because it became useless and dangerous to extend the prohibition to more remote degrees of consanguinity. Useless, because charity waxed cold in many hearts so that they had scarcely a greater bond of friendship with their more remote kindred than with strangers: and it was dangerous because through the prevalence of concupiscence and neglect men took no account of so numerous a kindred, and thus the prohibition of the more remote degrees became for many a snare leading to damnation. Moreover there is a certain fittingness in the restriction of the above prohibition to the fourth degree. First because men are wont to live until the fourth generation, so that consanguinity cannot lapse into oblivion, wherefore God threatened (Ex. 20:5) to visit the parent's sins on their children to the third and fourth generation. Secondly, because in each generation the blood, the identity of which causes consanguinity, receives a further addition of new blood, and the more another blood is added the less there is of the old. And because there are four elements, each of which is the more easily mixed with another, according as it is more rarefied it follows that at the first admixture the identity of blood disappears as regards the first element which is most subtle; at the second admixture, as regards the second element; at the third, as to the third element; at the fourth, as to the fourth element. Thus after the fourth generation it is fitting for the carnal union to be repeated.

  Reply to Objection 1: Even as God does not join together those who are joined together against the Divine command, so does He not join together those who are joined together against the commandment of the Church, which has the same binding force as a commandment of God.

  Reply to Objection 2: Matrimony is not only a sacrament but also fulfills an office; wherefore it is more subject to the control of the Church's ministers than baptism which is a sacrament only: because just as human contracts and offices are controlled by human laws, so are spiritual contracts and offices controlled by the law of the Church.

  Reply to Objection 3: Although the tie of consanguinity is natural, it is not natural that consanguinity forbid carnal intercourse, except as regards certain degrees, as stated above (Article [3]). Wherefore the Church's commandment does not cause certain people to be kin or not kin, because they remain equally kin at all times: but it makes carnal intercourse to be lawful or unlawful at different times for different degrees of consanguinity.

  Reply to Objection 4: The reasons assigned are given as indicating aptness and congruousness rather than causality and necessity.

  Reply to Objection 5: The reason for the impediment of consanguinity is not the same at different times: wherefore that which it was useful to allow at one time, it was beneficial to forbid at another.

  Reply to Objection 6: A commandment does not affect the past but the future. Wherefore if the fifth degree which is now allowed were to be forbidden at any time, those in the fifth degree who are married would not have to separate, because no impediment supervening to marriage can annul it; and consequently a union which was a marriage from the first would not be made incestuous by a commandment of the Church. In like manner, if a degree which is now forbidden were to be allowed, such a union would not become a marriage on account of the Church's commandment by reason of the former contract, because they could separate if they wished. Nevertheless, they could contract anew, and this would be a new union.

  Reply to Objection 7: In prohibiting the degrees of consanguinity the Church considers chiefly the point of view of affection. And since the reason for affection towards one's brother's son is not less but even greater than the reasons for affection towards one's father's brother, inasmuch as the son is more akin to the father than the father to the son (Ethic. viii, 12), therefore did the Church equally prohibit the degrees of consanguinity in uncles and nephews. On the other hand the Old Law in debarring certain persons looked chiefly to the danger of concupiscence arising from cohabitation; and debarred those persons who were in closer intimacy with one another on account of their living together. Now it is more usual for a niece to live with her uncle than an aunt with her nephew: because a daughter is more identified with her father, being part of him, whereas a sister is not in this way identified with her brother, for she is not part of him but is born of the same parent. Hence there was not the same reason for debarring a niece and an aunt.

Question: 55  OF THE IMPEDIMENT OF AFFINITY (ELEVEN ARTICLES)

   We must consider next the impediment of affinity. Under this head there are eleven points of inquiry:

    (1) Whether affinity results from matrimony?

    (2) Whether it remains after the death of husband or wife?

    (3) Whether it is caused through unlawful intercourse?

    (4) Whether it arises from a betrothal?

    (5) Whether affinity is caused through affinity?

    (6) Whether affinity is an impediment to marriage?

    (7) Whether affinity in itself admits of degrees?

    (8) Whether its degrees extend as far as the degrees of consanguinity?

    (9) Whether marriages of persons related to one another by consanguinity or affinity should always be dissolved by divorce?

    (10) Whether the process for the dissolution of like marriages should always be by way of accusation?

    (11) Whether witnesses should be called in such a case?
 
Article: 1 

Whether a person contracts affinity through the marriage of a blood-relation?

  Objection 1: It would seem that a person does not contract affinity through the marriage of a blood-relation. For "the cause of a thing being so is yet more so." Now the wife is not connected with her husband's kindred except by reason of the husband. Since then she does not contract affinity with her husband, neither does she contract it with her husband's kindred.

  Objection 2: Further, if certain things be separate from one another and something be connected with one of them, it does not follow that it is connected with the other. Now a person's blood relations are separate from one another. Therefore it does not follow, if a certain woman be married to a certain man, that she is therefore connected with all his kindred.

  Objection 3: Further, relations result from certain things being united together. Now the kindred of the husband do not become united together by the fact of his taking a wife. Therefore they do not acquire any relationship of affinity.

  On the contrary, Husband and wife are made one flesh. Therefore if the husband is related in the flesh to all his kindred, for the same reason his wife will be related to them all.

   Further, this is proved by the authorities quoted in the text (Sent. iv, D, 41).

  I answer that, A certain natural friendship is founded on natural fellowship. Now natural fellowship, according to the Philosopher (Ethic. viii, 12), arises in two ways; first, from carnal procreation; secondly, from connection with orderly carnal procreation, wherefore he says (Ethic. viii, 12) that the friendship of a husband towards his wife is natural. Consequently even as a person through being connected with another by carnal procreation is bound to him by a tie of natural friendship, so does one person become connected with another through carnal intercourse. But there is a difference in this, that one who is connected with another through carnal procreation, as a son with his father, shares in the same common stock and blood, so that a son is connected with his father's kindred by the same kind of tie as the father was, the tie, namely of consanguinity, albeit in a different degree on account of his being more distant from the stock: whereas one who is connected with another through carnal intercourse does not share in the same stock, but is as it were an extraneous addition thereto: whence arises another kind of tie known by the name of "affinity." This is expressed in the verse:

   Marriage makes a new kind of connection,

   While birth makes a new degree, because, to wit, the person begotten is in the same kind of relationship, but in a different degree, whereas through carnal intercourse he enters into a new kind of relationship.

  Reply to Objection 1: Although a cause is more potent than its effect, it does not always follow that the same name is applicable to the cause as to the effect, because sometimes that which is in the effect, is found in the cause not in the same but in a higher way; wherefore it is not applicable to both cause and effect under the same name or under the same aspect, as is the case with all equivocal effective causes. Thus, then, the union of husband and wife is stronger than the union of the wife with her husband's kindred, and yet it ought not to be named affinity, but matrimony which is a kind of unity; even as a man is identical with himself, but not with his kinsman.

  Reply to Objection 2: Blood-relations are in a way separate, and in a way connected: and it happens in respect of their connection that a person who is connected with one of them is in some way connected with all of them. But on account of their separation and distance from one another it happens that a person who is connected with one of them in one way is connected with another in another way, either as to the kind of connection or as to the degree.

  Reply to Objection 3: Further, a relation results sometimes from a movement in each extreme, for instance fatherhood and sonship, and a relation of this kind is really in both extremes. Sometimes it results from the movement of one only, and this happens in two ways. In one way when a relation results from the movement of one extreme without any movement previous or concomitant of the other extreme; as in the Creator and the creature, the sensible and the sense, knowledge and the knowable object: and then the relation is in one extreme really and in the other logically only. In another way when the relation results from the movement of one extreme without any concomitant movement, but not without a previous movement of the other; thus there results equality between two men by the increase of one, without the other either increasing or decreasing then, although previously he reached his actual quantity by some movement or change, so that this relation is founded really in both extremes. It is the same with consanguinity and affinity, because the relation of brotherhood which results in a grown child on the birth of a boy, is caused without any movement of the former's at the time, but by virtue of that previous movement of his wherein he was begotten; wherefore at the time it happens that there results in him the aforesaid relation through the movement of another. Likewise because this man descends through his own birth from the same stock as the husband, there results in him affinity with the latter's wife, without any new change in him.
 
Article: 2  

Whether affinity remains after the death of husband or wife?

  Objection 1: It would seem that affinity does not remain after the death of husband or wife, between the blood-relations of husband and wife or "vice versa." Because if the cause cease the effect ceases. Now the cause of affinity was the marriage, which ceases after the husband's death, since then "the woman . . . is loosed from the law of the husband" (Rm. 7:2). Therefore the aforesaid affinity ceases also.

  Objection 2: Further, consanguinity is the cause of affinity. Now the consanguinity of the husband with his blood-relations ceases at his death. Therefore, the wife's affinity with them ceases also.

  On the contrary, Affinity is caused by consanguinity. Now consanguinity binds persons together for all time as long as they live. Therefore affinity does so also: and consequently affinity (between two persons) is not dissolved through the dissolution of the marriage by the death of a third person.

  I answer that, A relation ceases in two ways: in one way through the corruption of its subject, in another way by the removal of its cause; thus likeness ceases when one of the like subjects dies, or when the quality that caused the likeness is removed. Now there are certain relations which have for their cause an action, or a passion or movement (Metaph. v, 20): and some of these are caused by movement, through something being moved actually; such is the relation between mover and moved: some of them are caused through something being adapted to movement, for instance the relations between the motive power and the movable, or between master and servant; and some of them result from something, having been moved previously, such as the relation between father and son, for the relation between them is caused not by (the con) being begotten now, but by his having been begotten. Now aptitude for movement and for being moved is transitory; whereas the fact of having been moved is everlasting, since what has been never ceases having been. Consequently fatherhood and sonship are never dissolved through the removal of the cause, but only through the corruption of the subject, that is of one of the subjects. The same applies to affinity, for this is caused by certain persons having been joined together not by their being actually joined. Wherefore it is not done away, as long as the persons between whom affinity has been contracted survive, although the person die through whom it was contracted.

  Reply to Objection 1: The marriage tie causes affinity not only by reason of actual union, but also by reason of the union having been effected in the past.

  Reply to Objection 2: Consanguinity is not the chief cause of affinity, but union with a blood-relation, not only because that union is now, but because it has been. Hence the argument does not prove.
 
Article: 3 

Whether unlawful intercourse causes affinity?

  Objection 1: It would seem that unlawful intercourse does not cause affinity. For affinity is an honorable thing. Now honorable things do not result from that which is dishonorable. Therefore affinity cannot be caused by a dishonorable intercourse.

  Objection 2: Further, where there is consanguinity there cannot be affinity; since affinity is a relationship between persons that results from carnal intercourse and is altogether void of blood-relationship. Now if unlawful intercourse were a cause of affinity, it would sometimes happen that a man would contract affinity with his blood-relations and with himself: for instance when a man is guilty of incest with a blood-relation. Therefore affinity is not caused by unlawful intercourse.

  Objection 3: Further, unlawful intercourse is according to nature or against nature. Now affinity is not caused by unnatural unlawful intercourse as decided by law (can. Extraordinaria, xxxv, qu. 2,3). Therefore it is not caused only by unlawful intercourse according to nature.

  On the contrary, He who is joined to a harlot is made one body (1 Cor. 6:16). Now this is the reason why marriage caused affinity. Therefore unlawful intercourse does so for the same reason.

   Further, carnal intercourse is the cause of affinity, as shown by the definition of affinity, which definition is as follows: Affinity is the relationship of persons which results from carnal intercourse and is altogether void of blood-relationship. But there is carnal copulation even in unlawful intercourse. Therefore unlawful intercourse causes affinity.

  I answer that, According to the Philosopher (Ethic. viii, 12) the union of husband and wife is said to be natural chiefly on account of the procreation of offspring, and secondly on account of the community of works: the former of which belongs to marriage by reason of carnal copulation, and the latter, in so far as marriage is a partnership directed to a common life. Now the former is to be found in every carnal union where there is a mingling of seeds, since such a union may be productive of offspring, but the latter may be wanting. Consequently since marriage caused affinity, in so far as it was a carnal mingling, it follows that also an unlawful intercourse causes affinity in so far as it has something of natural copulation.

  Reply to Objection 1: In an unlawful intercourse there is something natural which is common to fornication and marriage, and in this respect it causes affinity. There is also something which is inordinate whereby it differs from marriage, and in this respect it does not cause affinity. Hence affinity remains honorable, although its cause is in a way dishonorable.

  Reply to Objection 2: There is no reason why diverse relations should not be in the same subject by reason of different things. Consequently there can be affinity and consanguinity between two persons, not only on account of unlawful but also on account of lawful intercourse: for instance if a blood-relation of mine on my father's side marries a blood-relation of mine on my mother's side. Hence in the above definition the words "which is altogether void of blood-relationship" apply to affinity as such. Nor does it follow that a man by having intercourse with his blood-relation contracts affinity with himself, since affinity, like consanguinity, requires diversity of subjects, as likeness does.

  Reply to Objection 3: In unnatural copulation there is no mingling of seeds that makes generation possible: wherefore a like intercourse does not cause affinity.
 
Article: 4 

Whether affinity is caused by betrothal?

  Objection 1: It would seem that affinity cannot be caused by betrothal. For affinity is a lasting tie: whereas a betrothal is sometimes broken off. Therefore it cannot cause affinity.

  Objection 2: Further if the hymen be penetrated without the deed being consummated, affinity is not contracted. Yet this is much more akin to carnal intercourse than a betrothal. Therefore betrothal does not cause affinity.

  Objection 3: Further, betrothal is nothing but a promise of future marriage. Now sometimes there is a promise of future marriage without affinity being contracted, for instance if it take place before the age of seven years; or if a man having a perpetual impediment of impotence promise a woman future marriage; or if a like promise be made between persons to whom marriage is rendered unlawful by a vow; or in any other way whatever. Therefore betrothal cannot cause affinity.

  On the contrary, Pope Alexander (cap. Ad audiendem, De spons. et matrim.) forbade a certain woman to marry a certain man, because she had been betrothed to his brother. Now this would not be the case unless affinity were contracted by betrothal. Therefore, etc.

  I answer that, Just as a betrothal has not the conditions of a perfect marriage, but is a preparation for marriage, so betrothal causes not affinity as marriage does, but something like affinity. This is called "the justice of public honesty," which is an impediment to marriage even as affinity and consanguinity are, and according to the same degrees, and is defined thus: "The justice of public honesty is a relationship arising out of betrothal, and derives its force from ecclesiastical institution by reason of its honesty." This indicates the reason of its name as well as its cause, namely that this relationship was instituted by the Church on account of its honesty.

  Reply to Objection 1: Betrothal, by reason not of itself but of the end to which it is directed, causes this kind of affinity known as "the justice of public honesty": wherefore just as marriage is a lasting tie, so is the aforesaid kind of affinity.

  Reply to Objection 2: In carnal intercourse man and woman become one flesh by the mingling of seeds. Wherefore it is not every invasion or penetration of the hymen that causes affinity to be contracted, but only such as is followed by a mingling of seeds. But marriage causes affinity not only on account of carnal intercourse, but also by reason of the conjugal fellowship, in respect of which also marriage is according to nature. Consequently affinity results from the marriage contract itself expressed in words of the present and before its consummation, and in like manner there results from betrothal, which is a promise of conjugal fellowship, something akin to affinity, namely the justice of public honesty.

  Reply to Objection 3: All those impediments which void a betrothal prevent affinity being contracted through a promise of marriage. Hence whether he who actually promises marriage be lacking in age, or be under a solemn vow of continence or any like impediment, no affinity nor anything akin to it results because the betrothal is void. If however, a minor, laboring under insensibility or malefice, having a perpetual impediment, is betrothed before the age of puberty and after the age of seven years, with a woman who is of age, from such a contract there results the impediment called "justice of public honesty," because at the time the impediment was not actual, since at that age the boy who is insensible is equally impotent in respect of the act in question.
 
Article: 5 

Whether affinity is a cause of affinity?

  Objection 1: It would seem that affinity also is a cause of affinity. For Pope Julius I says (cap. Contradicimus 35, qu. iii): "No man may marry his wife's surviving blood-relation": and it is said in the next chapter (cap. Porro duorum) that "the wives of two cousins are forbidden to marry, one after the other, the same husband." But this is only on account of affinity being contracted through union with a person related by affinity. Therefore affinity is a cause of affinity.

  Objection 2: Further, carnal intercourse makes persons akin even as carnal procreation, since the degrees of affinity and consanguinity are reckoned equally. But consanguinity causes affinity. Therefore affinity does also.

  Objection 3: Further, things that are the same with one and the same are the same with one another. But the wife contracts the same relations with all her husband's kindred. Therefore all her husband's kindred are made one with all who are related by affinity to the wife, and thus affinity is the cause of affinity.

  Objection 4: On the contrary, If affinity is caused by affinity a man who has connection with two women can marry neither of them, because then the one would be related to the other by affinity. But this is false. Therefore affinity does not cause affinity.

  Objection 5: Further, if affinity arose out of affinity a man by marrying another man's widow would contract affinity with all her first husband's kindred, since she is related to them by affinity. But this cannot be the case because he would become especially related by affinity to her deceased husband. Therefore, etc.

  Objection 6: Further, consanguinity is a stronger tie than affinity. But the blood-relations of the wife do not become blood-relations of the husband. Much less, therefore, does affinity to the wife cause affinity to her blood-relations, and thus the same conclusion follows.

  I answer that, There are two ways in which one thing proceeds from another: in one way a thing proceeds from another in likeness of species, as a man is begotten of a man: in another way one thing proceeds from another, not in likeness of species; and this process is always towards a lower species, as instanced in all equivocal agents. The first kind of procession, however often it be repeated, the same species always remains: thus if one man be begotten of another by an act of the generative power, of this man also another man will be begotten, and so on. But the second kind of procession, just as in the first instance it produces another species, so it makes another species as often as it is repeated. Thus by movement from a point there proceeds a line and not a point, because a point by being moved makes a line; and from a line moved lineally, there proceeds not a line but a surface, and from a surface a body, and in this way the procession can go no further. Now in the procession of kinship we find two kinds whereby this tie is caused: one is by carnal procreation, and this always produces the same species of relationship; the other is by the marriage union, and this produces a different kind of relationship from the beginning: thus it is clear that a married woman is related to her husband's blood-relations not by blood but by affinity. Wherefore if this kind of process be repeated, the result will be not affinity but another kind of relationship; and consequently a married party contracts with the affines of the other party a relation not of affinity but of some other kind which is called affinity of the second kind. And again if a person through marriage contracts relationship with an affine of the second kind, it will not be affinity of the second kind, but of a third kind, as indicated in the verse quoted above (Article [1]). Formerly these two kinds were included in the prohibition, under the head of the justice of public honesty rather than under the head of affinity, because they fall short of true affinity, in the same way as the relationship arising out of betrothal. Now however they have ceased to be included in the prohibition, which now refers only to the first kind of affinity in which true affinity consists.

  Reply to Objection 1: A husband contracts affinity of the first kind with his wife's male blood-relation, and affinity of the second kind with the latter's wife: wherefore if the latter man dies the former cannot marry his widow on account of the second kind of affinity. Again if a man A marry a widow B, C, a relation of her former husband being connected with B by the first kind of affinity, contracts affinity of the second kind with her husband A; and D, the wife of this relation C being connected, by affinity of the second kind, with B, this man's wife contracts affinity of the third kind with her husband A. And since the third kind of affinity was included in the prohibition on account of a certain honesty more than by reason of affinity, the canon (cap. Porro duorum 35, qu. iii) says: "The justice of public honesty forbids the wives of two cousins to be married to the same man, the one after the other." But this prohibition is done away with.

  Reply to Objection 2: Although carnal intercourse is a cause of people being connected with one another, it is not the same kind of connection.

  Reply to Objection 3: The wife contracts the same connection with her husband's relatives as to the degree but not as to the kind of connection.

   Since however the arguments in the contrary sense would seem to show that no tie is caused by affinity, we must reply to them lest the time-honored prohibition of the Church seem unreasonable.

  Reply to Objection 4: As stated above, a woman does not contract affinity of the first kind with the man to whom she is united in the flesh, wherefore she does not contract affinity of the second kind with a woman known by the same man; and consequently if a man marry one of these women, the other does not contract affinity of the third kind with him. And so the laws of bygone times did not forbid the same man to marry successively two women known by one man.

  Reply to Objection 5: As a man is not connected with his wife by affinity of the first kind, so he does not contract affinity of the second kind with the second husband of the same wife. Wherefore the argument does not prove.

  Reply to Objection 6: One person is not connected with me through another, except they be connected together. Hence through a woman who is affine to me, no person becomes connected with me, except such as is connected with her. Now this cannot be except through carnal procreation from her, o