Jerome
Catena Aurea · Matthäusevangelium 19
His disciples say unto him, If the case of the man be so with his wife, it is not good to marry. But he said unto them, All men cannot receive this saying, save they to whom it is given. For there are some eunuchs, which were so born from their mother’s womb: and 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. He that is able to receive it, let him receive it.
(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 themobtain 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.