Matthew 19:12

The cause in one item he assigns nature; in the next violence, and in the last his own choice, in him, namely, that determined to be so from hope of the kingdom of heaven.

For since to speak of virginity seemed to be grievous, by the constraint of this law He drove them to this desire. Then to show the possibility of it, He saith, "There are some eunuchs, who were so born from their mother's womb, there are some eunuchs which were made eunuchs of men, and there be eunuchs which have made themselves eunuchs for the kingdom of Heaven's sake," by these words secretly leading them to choose the thing, and establishing the possibility of this virtue, and all but saying, Consider if thou wert in such case by nature, or hadst endured this selfsame thing at the hands of those who inflict such wanton injuries, what wouldest thou have done, being deprived indeed of the enjoyment, yet not having a reward? Thank God therefore now, for that with rewards and crowns thou undergoest this, which those men endure without crowns; or rather not ever this, but what is much lighter, being supported both by hope, and by the consciousness of the good work, and not having the desire so raging like waves within thee. For the excision of a member is not able to quell such waves, and to make a calm, like the curb of reason; or rather, reason only can do this. For this intent therefore He brought in those others, even that He might encourage these, since if this was not what He was establishing, what means His saying concerning the other eunuchs? But when He saith, that they made themselves eunuchs, He means not the excision of the members, far from it, but the putting away of wicked thoughts. Since the man who hath mutilated himself, in fact, is subject even to a curse, as Paul saith, "I would they were even cut off which trouble you." And very reasonably. For such a one is venturing on the deeds of murderers, and giving occasion to them that slander God's creation, and opens the mouths of the Manichaeans, and is guilty of the same unlawful acts as they that mutilate themselves amongst the Greeks. For to cut off our members hath been from the beginning a work of demoniacal agency, and satanic device, that they may bring up a bad report upon the work of God, that they may mar this living creature, that imputing all not to the choice, but to the nature of our members, the more part of them may sin in security, as being irresponsible; and doubly harm this living creature, both by mutilating the members, and by impeding the forwardness of the free choice in behalf of good deeds. These are the ordinances of the devil, bringing in, besides the things which we have mentioned, another wicked doctrine also, and making way beforehand for the arguments concerning destiny and necessity even from hence, and everywhere marring the freedom given to us of God, and persuading us that evil deeds are of nature, and hence secretly implanting many other wicked doctrines, although not openly. For such are the devil's poisons. Therefore I beseech you to flee from such lawlessness. For together with the things I have mentioned, neither doth the force of lust become milder hereby, but even more fierce. For from another origin hath the seed that is in us its sources, and from another cause do its waves swell. And some say from the brain, some from the loins, this violent impulse hath its birth; but I should say from nothing else than from an ungoverned will and a neglected mind: if this be temperate, there is no evil result from the motions of nature. Having spoken then of the eunuchs that are eunuchs for nought and fruitlessly, unless with the mind they too practise temperance, and of those that are virgins for Heaven's sake, He proceeds again to say, "He that is able to receive it, let him receive it," at once making them more earnest by showing that the good work is exceeding in greatness, and not suffering the thing to be shut up in the compulsion of a law, because of His unspeakable gentleness. And this He said, when He showed it to be most possible, in order that the emulation of the free choice might be greater.

He speaks of three kinds of eunuchs, of whom two are carnal, and one spiritual. One, those who are so born of their mother's womb; another, those whom enemies or courtly luxury has made so; a third, those who have made themselves so for the kingdom of heaven, and who might have been men, but become eunuchs for Christ. To them the reward is promised, for to the others whose continence was involuntary, nothing is due. (cf. Orig. in loc.) Or we may say otherwise. The eunuchs from their mothers' wombs are they whose nature is colder, and not prone to lust. And they that are made so of men are they whom physicians made so, or they whom worship of idols has made effeminate, or who from the influence of heretical teaching pretend to chastity, that they may thereupon claim truth for their tenets. But none of them obtain the kingdom of heaven, save he only who has become a eunuch for Christ's sake. Whence it follows, He that is able to receive it, let him receive it; let each calculate his own strength, whether he is able to fulfil the rules of virginity and abstinence. For in itself continence is sweet and alluring, but each man must consider his strength, that he only that is able may receive it. This is the voice of the Lord exhorting and encouraging on His soldiers to the reward of chastity, that he who can fight might fight and conquer and triumph.

For as the deed without the will does not constitute a sin; so a righteous act is not in the deed unless the will go with it. That therefore is honourable continence, not which mutilation of body of necessity enforces, but which the will of holy purpose embraces. For they are born such, just as others are born having six or four fingers. For if God according as He formed our bodies in the beginning, had continued the same order unchangeably, the working of God would have been brought into oblivion among men. The order of nature is therefore changed at times from its nature, that God the framer of nature may be had in remembrance.