If thine enemy hunger, feed him; if he thirst, give him drink: q.d. Instead of rendering evil for evil to thine adversary, do him good for evil: see following verse.
Thou shalt heap coals of fire on his head; i.e. either make him relent, or bring down the greater vengeance from God upon him. This is taken out of Pro_25:21,22; See Poole on "Pro_25:21". See Poole on "Pro_25:22".