Matthew 5:43

"Ye have heard that it hath been said, Thou shalt love thy neighbor, and hate thine enemy. But I say unto you, love your enemies, and pray for them which despitefully use you: bless them that curse you, do good to them that hate you. That ye may become like your Father which is in Heaven; for He maketh His sun to rise on the evil and on the good, and sendeth rain on the just and on the unjust." See how He hath set the highest pinnacle on our good deeds. For this is why He teaches not only to endure a blow, but to offer the right cheek also; not only to add the cloak to the coat, but to travel also two miles with him who compels thee to go one; in order that thou mightest receive with all facility that which is much more than these. "But what," one may say, "is more than these?" Not even to count as an enemy him who is doing these things: or rather even somewhat else more than this. For He said not, "do not hate," but "love;" He said not, "do not injure," but "do good." And if any one should examine accurately, he will see that even to these things somewhat is added, much greater than they are. For neither did He simply command to love, but to pray. Seest thou how many steps He hath ascended, and how He hath set us on the very summit of virtue? Nay, mark it, numbering from the beginning. A first step is, not to begin with injustice: a second, after he hath begun, to vindicate one's self by equal retaliation; a third, not to do unto him that is vexing us the same that one hath suffered, but to be quiet; a fourth, even to give one's self up to suffer wrongfully; a fifth, to give up yet more than the other, who did the wrong, wishes; a sixth, not to hate him who hath done so; a seventh, even to love him; an eighth, to do him good also; a ninth, to entreat God Himself on his behalf. Seest thou, what height of self-command? Wherefore glorious too, as we see, is the reward which it hath. That is, because the thing enjoined was great, and needed a fervent soul, and much earnestness, He appoints for it also such a reward, as for none of the former. For He makes not mention here of earth, as with respect to the meek; nor of comfort and mercy, as with regard to the mourners and the merciful; nor of the kingdom of Heaven; but of that which was more thrilling than all; our becoming like God, in such wise as men might become so. For He saith, "That ye may become like unto your Father which is in Heaven." And observe, I pray thee, how neither in this place, nor in the preceding parts, doth He call Him His own Father, but in that instance, "God," and "a great King," when he was discoursing about oaths, and here, "their Father." And this He doth, as reserving for the proper season what He had to say touching these points.

(de Doctr. Christ. i. 30.) That by the command, Thou shalt love thy neighbour, all mankind were intended, the Lord showed in the parable of the man who was left half dead, which teaches us that our neighbour is every one who may happen at any time to stand in need of our offices of mercy; and this who does not see must be denied to none, when the Lord says, Do good to them that hate you. (cont. Faust. xix. 24.) I ask the Manichæans why they would have this peculiar to the Mosaic Law, that was said by them of old time, thou shall hate thy enemy? Has not Paul said of certain men that they were hateful to God? We must enquire then how we may understand that, after the example of God, to whom the Apostle here affirms some men to be hateful, our enemies are to be hated; and again after the same pattern of Him who maketh his sun to rise on the evil and the good, our enemies are to be loved. Here then is the rule by which we may at once hate our enemy for the evil's sake that is in him, that is, his iniquity, and love him for the good's sake that is in him, that is, his rational part. This then, thus uttered by them of old, being heard, but not understood, hurried men on to the hatred of man, when they should have hated nothing but vice. Such the Lord corrects as He proceeds, saying, I say unto you, Love your enemies. Lie who had just declared that He came not to subvert the Law, bat to fulfil it, by bidding us love our enemies, brought us to the understanding of how we may at once hate the same man for his sins whom we love for his human nature.

(Serm. in Mont. i. 21.) That there were degrees in the righteousness of the Pharisees which was under the old Law is seen herein, that many hated even those by whom they were loved. He therefore who loves his neighbour, has ascended one degree, though as yet he hate his enemy; which is expressed in that, and shalt hate his enemy; which is not to be understood as a command to the justified, but a concession to the weak.

(non occ.) The Lord has taught above that we must not resist one who offers any injury, but must be ready even to suffer more; He now further requires us to show to them that do us wrong both love and its effects. And as the things that have gone before pertain to the completion of the righteousness of the Law, in like manner this last precept is to be referred to the completion of the law of love, which, according to the Apostle, is the fulfilling of the Law. (ord.) But it should be known, that in the whole body of the Law it is no where written, Thou shalt hate thy enemy. But it is to be referred to the tradition of the Scribes, who thought good to add this to the Law, because the Lord bade the children of Israel pursue their enemies, and destroy Amalek from under heaven.