Proverbs 20:22
22 Say not thou, I will recompense evil; but wait on the LORD, and he shall save thee.
Those that live in this world must expect to have injuries done them, affronts given them, and trouble wrongfully created them, for we dwell among briers. Now here we are told what to do when we have wrong done us. 1. We must not avenge ourselves, no, nor so much as think of revenge, or design it: "Say not thou, no, not in thy heart, I will recompense evil for evil. Do not please thyself with the thought that some time or other thou shalt have an opportunity of being quits with him. Do not wish revenge, or hope for it, much less resolve upon it, no, not when the injury is fresh and the resentment of it most deep. Never say that thou wilt do a think which thou canst not in faith pray to God to assist thee in, and that thou canst not do in mediating revenge." 2. We must refer ourselves to God, and leave it to him to plead our cause, to maintain our right, and reckon with those that do us wrong in such a way and manner as he thinks fit and in his own due time: "Wait on the Lord, and attend his pleasure, acquiesce in his will, and he does not say that he will punish him that has injured thee (instead of desiring that thou must forgive him and pray for him), but he will save thee, and that is enough. He will protect thee, so that thy passing by one injury shall not (as is commonly feared) expose thee to another; nay, he will recompense good to thee, to balance thy trouble and encourage thy patience," as David hoped, when Shimei cursed him, 2 Sam. xvi. 12.
Proverbs 24:29
28 Be not a witness against thy neighbour without cause; and deceive not with thy lips. 29 Say not, I will do so to him as he hath done to me: I will render to the man according to his work.
We are here forbidden to be in any thing injurious to our neighbour, particularly in and by the forms of law, either, 1. As a witness: "Never bear a testimony against any man without cause, unless what thou sayest thou knowest to be punctually true and thou hast a clear call to testify it. Never bear a false testimony against any one;" for it follows, "Deceive not with thy lips; deceive not the judge and jury, deceive not those whom thou conversest with, into an ill opinion of thy neighbour. When thou speakest of thy neighbour do not only speak that which is true, but take heed lest, in the manner of thy speaking, thou insinuate any thing that is otherwise and so shouldst deceive by innuendos or hyperboles." Or, 2. As a plaintiff or prosecutor. If there be occasion to bring an action or information against thy neighbour, let it not be from a spirit of revenge. "Say not, I am resolved I will be even with him: I will do so to him as he had done to me." Even a righteous cause becomes unrighteous when it is thus prosecuted with malice. Say not, I will render to the man according to his work, and make him pay dearly for it; for it is God's prerogative to do so, and we must leave it to him, and not step into his throne, or take his work out of his hands. If we will needs be our own carvers, and judges in our own cause, we forfeit the benefit of an appeal to God's tribunal; therefore we must not avenge ourselves, because he has said, Vengeance is mine.
Proverbs 25:21-22
21 If thine enemy be hungry, give him bread to eat; and if he be thirsty, give him water to drink: 22 For thou shalt heap coals of fire upon his head, and the LORD shall reward thee.
By this it appears that, however the scribes and Pharisees had corrupted the law, not only the commandment of loving our brethren, but even that of loving our enemies, was not only a new, but also an old commandment, an Old-Testament commandment, though our Saviour has given it to us with the new enforcement of his own great example in loving us when we were enemies. Observe, 1. How we must express our love to our enemies by the real offices of kindness, even those that are expensive to ourselves and most acceptable to them: "If they be hungry and thirsty, instead of pleasing thyself with their distress and contriving how to cut off supplies from them, relieve them, as Elisha did the Syrians that came to apprehend him," 2 King vi. 22. 2. What encouragement we have to do so. (1.) It will be a likely means to win upon them, and bring them over to be reconciled to us; we shall mollify them as the refiner melts the metal in the crucible, not only by putting it over the fire, but by heaping coals of fire upon it. The way to turn an enemy into a friend is, to act towards him in a friendly manner. If it do not gain him, it will aggravate his sin and punishment, and heap the burning coals of God's wrath upon his head, as rejoicing in his calamity may be an occasion of God's turning his wrath from him, ch. xxiv. 17. (2.) However, we shall be no losers by our self-denial: "Whether he relent towards thee or no, the Lord shall reward thee; he shall forgive thee who thus showest thyself to be of a forgiving spirit. He shall provide for thee when thou art in distress (though thou hast been evil and ungrateful), as thou dost for thy enemy; at least it shall be recompensed in the resurrection of the just, when kindnesses done to our enemies shall be remembered as well as those shown to God's friends."