For there are some eunuchs, who were so born from their mother's womb: and there are some eunuchs, who were made eunuchs of men: and there are eunuchs, who have made themselves eunuchs for the kingdom of heaven's sake. He that is able to receive it, let him receive it.
All Commentaries on Matthew 19:12 Go To Matthew 19
Theophylact of Ochrid
AD 1107
There are few, He says, who can achieve this virginity. For there are some who are eunuchs from their mother’s womb, that is, by their physical temperament are never aroused towards sexual intercourse, so they are chaste without thereby deriving any profit. And there are those who have been made eunuchs by men. Those who have made themselves eunuchs for the kingdom of heaven’s sake are not those who have castrated themselves (for that is an accursed deed), but those who exercise self-control. You may also understand it this way. He is a eunuch by nature who, on account of his physical temperament, is not easily aroused to carnal pleasures. He who is made a eunuch by men is he who is guided by human teaching to cut off the burning of carnal desires. He who makes himself a eunuch is he who is instructed by no one else but by himself, and who, self-taught, inclines towards chastity. So this one is best who is guided not by another but by himself to the kingdom of heaven. Christ wants us of our own free will to practice virtue, saying, "He that is able to receive it, let him receive it." For Christ neither demands virginity, nor dissolves marriage, but He puts virginity first.