62 I have set down these things which I have been told are to be avoided, but the Apostle is the Master of virtues, and he teaches that gainsayers are to be convicted with patience, who lays down that one should be the husband of a single wife, not in order to exclude him from the right of marriage (for this is beyond the force of the precept), but that by conjugal chastity he may preserve the grace of his baptismal washing; nor again that he may be induced by the Apostle's authority to beget children in the priesthood; for he speaks of having children, not of begetting them, or marrying again.
Source: Letters (New Advent)