Never avenge yourselves, but leave it to the wrath of God, for it is written, “Vengeance is mine, I will repay, says the Lord.” To the contrary, “if your enemy is hungry, feed him; if he is thirsty, give him something to drink; for by so doing you will heap burning coals on his head.” (Rom. 12:19-20 ESV).If God does not show wrath, sooner or later we shall take justice into our own hands. But God says, 'Don't. I will see to it.'
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~ John Piper
foreword to the book Pierced for Our Transgressions
by Jeffery, Ovey, & Sach