For there are some eunuchs which were so born from their mother’s womb - persons constitutionally either incapable of or indisposed to marriage.
and there are some eunuchs which were made eunuchs of men - persons rendered incapable by others.
and there be eunuchs which have made themselves eunuchs for the kingdom of heaven’s sake - persons who, to do God’s work better, deliberately choose this state. Such was Paul (1Co 7:7).
He that is able to receive it, let him receive it - “He who feels this to be his proper vocation, let him embrace it”; which, of course, is as much as to say - “he only.” Thus, all are left free in this matter.