c. 386–397 · John Chrysostom, Homilies on Ephesians (In epistulam ad Ephesios homiliae 1-24) 17
He would have us cherish the tender heart of fathers towards each other. For by heart, here, is meant lovingkindness and compassion. For inasmuch as it cannot be that, being men, we shall avoid either giving pain or suffering it, he does the next thing, he devises a remedy,—that we should forgive one another. And yet there is no comparison. For if thou indeed shouldest at this moment forgive any one, he will forgive thee again in return; whereas to God thou hast neither given nor forgiven anything. And thou indeed art forgiving a fellow-servant; whereas God is forgiving a servant, and an enemy, and one that hates Him.