Proverbs 25:22

Heap coals of fire. There has been much difference of opinion as to the meaning of this metaphor. Some have felt that the coals of fire represent the burning shame and remorse with which the enemy is covered and that this was a form of vengeance gained by the innocent party. But one cannot very well conceive of God rewarding the taking of vengeance. He has claimed that vengeance belongs to Him (Heb. 10:30), and has bidden us to love our enemies and suffer whatever they may do to us (Matt. 5:44; James 5:6-8). Whatever the precise meaning, the metaphor seems most probably to represent an attempt to do good to the foe, even though such an action may give him further opportunity to sin against us.

Our material kindness to an enemy, by seeking him out when he should really come to us for reconciliation, may bring upon his head fires of repentance and sorrow for sin that will burn up all the ill will and make us good friends and fellow servants of the Lord.