Saint Anselm,
Cur Deus Homo — Book Second, Chapter XVIII…
“ For no one says that either celibacy or marriage ought not to be chosen; but we say that what a man esteems best before taking action upon any of these things, this he ought to do. And if a man preserves his celibacy as a free gift offered to God, he looks for a reward. When you say that the creature owes God what he knows to be the better choice, and what he is able to do, if you mean that he owes it as a debt, without implying any command on the part of God, it is not always true. ”
