Matthew 19:11-12

11 But he said to them, "Not all men can receive this saying, but only those to whom it is given.
12 For there are eunuchs who have been so from birth, and there are eunuchs who have been made eunuchs by men, and there are eunuchs who have made themselves eunuchs for the sake of the kingdom of heaven. He who is able to receive this, let him receive it."