Deuteronomy 32:35

But what parts of the law can I defend as good with a greater confidence than those which heresy has shown such a longing for? as the statute of retaliation, requiring eye for eye, tooth for tooth, and stripe for stripe. Now there is not here any smack of a permission to mutual injury; but rather, on the whole, a provision for restraining violence. To a people which was very obdurate, and wanting in faith towards God, it might seem tedious, and even incredible, to expect from God that vengeance which was subsequently to be declared by the prophet: “Vengeance is mine; I will repay, saith the Lord.” Therefore, in the meanwhile, the commission of wrong was to be checked by the fear of a retribution immediately to happen; and so the permission of this retribution was to be the prohibition of provocation, that a stop might thus be put to all hot-blooded injury, whilst by the permission of the …

“But I say unto you which hear” (displaying here that old injunction, of the Creator: “Speak to the ears of those who lend them to you”), “Love your enemies, and bless those which hate you, and pray for them which calumniate you.” These commands the Creator included in one precept by His prophet Isaiah: “Say, Ye are our brethren, to those who hate you.” For if they who are our enemies, and hate us, and speak evil of us, and calumniate us, are to be called our brethren, surely He did in effect bid us bless them that hate us, and pray for them who calumniate us, when He instructed us to reckon them as brethren. …

There is, too, another chief spur of impatience, the lust of revenge, dealing with the business either of glory or else of malice. But “glory,” on the one hand, is everywhere “vain;” and malice, on the other, is always odious to the Lord; in this case indeed most of all, when, being provoked by a neighbour’s malice, it constitutes itself superior in following out revenge, and by paying wickedness doubles that which has once been done. Revenge, in the estimation of error, seems a solace of pain; in the estimation of truth, on the contrary, it is convicted of malignity. For what difference is there between provoker and provoked, except that the former is detected as prior in evil-doing, but the latter as posterior? Yet each stands impeached of hurting a man in the eye of the Lord, who both prohibits and condemns every wickedness. …

58. And in like manner Moses, knowing beforehand that the people would reject and disown the true Saviour of the world, and take part with error, and choose an earthly king, and set the heavenly King at nought, says: “Is not this laid up in store with me, and sealed up among my treasures? In the day of vengeance I will recompense (them), and in the time when their foot shall slide.” They did slide, therefore, in all things, as they were found to be in harmony with the truth in nothing: neither as concerns the law, because they became transgressors; nor as concerns the prophets, because they cut off even the prophets themselves; nor as concerns the voice of the Gospels, because they crucified the Saviour Himself; nor in believing the apostles, because they persecuted them. …

“Say not, I will avenge me of mine enemy; but wait for the Lord, that He may be thy help.” Also elsewhere: “To me belongeth vengeance; I will repay, saith the Lord.” Also in Zephaniah: “Wait on me, saith the Lord, in the day of my rising again to witness; because my judgment is to the congregations of the Gentiles, that I may take kings, and pour out upon them my anger.”

11. …On this account therefore be merciful without fear, extend love even unto thine enemies: punish those who chance to belong to thy government, restrain them with affection, with charity, in regard to their eternal salvation; lest while thou sparest the flesh, the soul perish. Do this: and though thou have to endure many, over whom thou canst not exercise discipline, because thou hast no lawful authority over them; bear their injuries; be without apprehension. He will show mercy unto thee if thou shalt have been merciful: thou shalt be merciful, without the injuries thou sufferest losing their punishment; “To Me belongeth vengeance, I will repay,” saith the Lord.

31. I might well reply as I have done even if it were a question of a promise made with full consciousness. But this is a new and shameless thing; he throws in my teeth a mere dream. How am I to answer? I have no time for thinking of anything outside my own sphere. I wish that I were not prevented from reading even the Holy Scriptures by the throngs that beset this place, and the gathering of Christians from all parts of the world. Still, when a man makes a dream into a crime, I can quote to him the words of the Prophets, who say that we are not to believe dreams; for even to dream of adultery does not condemn us to hell, and to dream of the crown of martyrdom does not raise us to heaven. Often I have seen myself in dreams dead and placed in the grave: often I have flown over the earth and been carried as if swimming through the air, over mountains and seas. …

84. But what better pattern can there be than that of Divine justice? For the Son of God says: “Love your enemies;” and again: “Pray for those that persecute you and speak against you.” So far does He remove the desire of vengeance from the perfect that He commands charity towards those who injure them. And since He had said in the Old Testament: “Vengeance is Mine, I will repay.” He says in the Gospel, that we are to pray for those who have injured us, that He Who has said that He will avenge, may not do so; for it is His will to pardon at your desire with which according to His promise He agrees. But if you seek for you know that the unjust is more severely punished by his own convictions than by judicial severity.