Anselm of Canterbury on Forgiveness
Cur Deus Homo ("Why God Became Man") (1033-1109).
Of forgiveness, indeed, I speak briefly, for, as we said above, vengeance in no sense belongs to you, since you are not your own, nor is he who injures you yours or his, but you are both the servants of one Lord, made by him out of nothing. And if you avenge yourself upon your fellow servant, you proudly assume judgment over him when it is the peculiar right of God, the judge of all. But what do you give to God by your obedience, which is not owed him already, since he demands from you all that you are and have and can become?