391–430 · Augustine of Hippo, Sermons on Selected Lessons of the New Testament (Sermones 51-147) 40.9
So do thou too bend the knee, and beat thy forehead against the ground, and as thou art about to approach the Table of the Lord, the Feast of the Holy Scriptures, do not say, “O that mine enemy might die! Lord, if I have deserved ought of Thee, slay mine enemy.” Because if so be that thou sayest so, dost thou not fear lest He should answer thee, “If I should choose to slay thine enemy, I should first slay thee. What! dost thou glory because thou hast now come invited hither? Think only what thou wast but a little while ago. Hast thou not blasphemed Me? hast thou not derided Me? didst thou not wish to wipe out My Name from off the earth? Yet now thou dost applaud thyself because thou hast come invited hither! If I had slain thee when thou wast Mine enemy, how could I have made thee My friend? Why, by thy wicked prayers dost thou teach Me to do, what I did not in thine own case?” Yea rather God saith to thee, “Let me teach thee to imitate Me. When I was hanging on the Cross, I said, ‘Forgive them, for they know not what they do.’