Thomas Aquinas

“ Equality of quantity is that which is observed between two quantities of the same measure, for instance a thing two cubits long and another two cubits in length. But equality of proportion is that which is observed between two proportions of the same kind as double to double. Accordingly, speaking of the first equality, husband and wife are not equal in marriage; neither as regards the marriage act, wherein the more noble part is due to the husband, nor as regards the household management, wherein the wife is ruled and the husband rules. ”

“ For the husband having the more noble part in the marriage act, it is natural that he should be less ashamed than the wife to ask for the debt. Hence it is that the wife is not bound to pay the debt to her husband without being asked, whereas the husband is bound to pay it to the wife. ”

“ I answer that, In this regard some have asserted that a menstruous woman may not pay the debt even as she may not ask for it. For just as she would not be bound to pay it if she had some personal ailment so as to make it dangerous for herself, so is she not bound to pay for fear of danger to the offspring. But this opinion would seem to derogate from marriage, by which the husband is given entire power of his wife's body with regard to the marriage act. ”

“ It is possible through fulfilling a precept to render oneself unfit for the exercise of a sacred duty: thus a judge becomes irregular by sentencing a man to death. In like manner he who pays the marriage debt, in fulfillment of the precept, becomes unfit for the exercise of divine offices, not because the act in question is sinful, but on account of its carnal nature. ”

“ Leprosy voids a betrothal but not a marriage. Wherefore a wife is bound to pay the debt even to a leprous husband. But she is not bound to cohabit with him, because she is not so liable to infection from marital intercourse as from continual cohabitation. ”

“ The wife has no power over her husband's body, except as is consistent with the welfare of his person, as stated above. Wherefore if she go beyond this in her demands, it is not a request for the debt, but an unjust exaction; and for this reason the husband is not bound to satisfy her. ”

“ I answer that, Although the marriage act is void of sin, nevertheless since it oppresses the reason on account of the carnal pleasure, it renders man unfit for spiritual things. Therefore, on those days when one ought especially to give one's time to spiritual things, it is not lawful to ask for the debt. ”

“ Further, it is an affirmative precept that binds us to pray, and therefore we are bound to do so at a fixed time. Therefore one ought not to pay the debt at a time when one is bound to pray, as neither ought one at a time when one is bound to fulfill a special duty towards a temporal master. ”

“ I answer that, When the newly married spouse is given to her husband, the minds of husband and wife are taken up with carnal preoccupations by reason of the very newness of things, wherefore weddings are wont to be signalized by much unrestrained rejoicing. On this account it is forbidden to celebrate marriages at those times when men ought especially to arise to spiritual things. ”

“ It would seem that husband and wife are not mutually bound, under the obligation of a precept, to the payment of the marriage debt. For no one is forbidden to receive the Eucharist on account of fulfilling a precept. ”

“ The issue of seed in a man is the result of infirmity, nor is the seed in this case apt for generation. Moreover a complaint of this kind is continual or lasting like leprosy: wherefore the comparison falls. ”

“ If however, he ask in ignorance, the wife may put forward some motive, or allege sickness as a reason for not paying the debt, unless there be fear of danger to her husband. If, however, the husband ultimately persists in his request, she must yield to his demand. ”

“ Further, marriages that are contracted in despite of the law of the Church ought to be dissolved. Yet marriages are not dissolved if they be contracted at those times. Therefore it should not be forbidden by a commandment of the Church. ”