Psalms 109:5

It is the unspeakable comfort of all believers, that whoever is against them, God is for them; and to him they may apply as to one pleased to concern himself for them. David's enemies laughed at him for his devotion, but they could not laugh him out of it.

And they have rewarded me evil for good, and hatred for my love. Evil for good is devil like. This is Satan's line of action, and his children upon earth follow it greedily; it is cruel, and wounds to the quick. The revenge which pays a man back in his own coin has a kind of natural justice in it; but what shall be said of that baseness which returns to goodness the very opposite of what it has a right to expect? Our Lord endured such base treatment all his days, and, alas, in his members, endures it still. Thus we see the harmless and innocent man upon his knees pouring out his lamentation: we are now to observe him rising from the mercy seat, inspired with prophetic energy, and pouring forth upon his foes the forewarning of their doom. We shall hear him speak like a judge clothed with stern severity, or like the angel of doom robed in vengeance, or as the naked sword of justice when she bares her arm for execution. It is not for himself that he speaks so much as for all the slandered and the down trodden, of whom he feels himself to be the representative and mouthpiece. He asks for justice, and as his soul is stung with cruel wrongs he asks with solemn deliberation, making no stint in his demands. To pity malice would be malice to mankind; to screen the crafty seekers of human blood would be cruelty to the oppressed. Nay, love, and truth, and pity lift their wounds to heaven, and implore vengeance on the enemies of the innocent and oppressed; those who render goodness itself a crime, and make innocence a motive for hate, deserve to find no mercy from the great Preserver of men. Vengeance is the prerogative of God, and as it would be a boundless calamity if evil were for ever to go unpunished, so it is an unspeakable blessing that the Lord will recompense the wicked and cruel man, and there are times and seasons when a good man ought to pray for that blessing. When the Judge of all threatens to punish tyrannical cruelty and false hearted treachery, virtue gives her assent and consent. Amen, so let it be, saith every just man in his inmost soul.