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
Hilary of Poitiers
AD 368
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.