Therefore if your enemy hungers, feed him; if he thirsts, give him drink: for in so doing you shall heap coals of fire on his head.
All Commentaries on Romans 12:20 Go To Romans 12
John Chrysostom
AD 407
Paul said this in order to humble the wrongdoer by fear and to make the person wronged more ready to act, through hope of receiving some reward. For the one who has been wronged, when he is feeble, is not so much taken with his own goods as with the vengeance which he wants to wreak on the person who has hurt him. There is nothing so sweet as to see an enemy chastised.