What do we do to our enemy when we give him food, drink, or other assistance?...

We heap burning coals on his head.

If someone harms us deliberately, and we then respond in kindness and forgiveness, he must make one of two choices: he must either repair the harm he has done to us or else gloat over his victory. If he repents and repairs the harm, a brother has been gained. If he gloats over his victory, the wrath of God abides on him and every injury will return to him tenfold.

Divine coals will burn his head until he makes one choice or the other. In the Kingdom of God it is the person who is strong enough to forgive who is the victor, the overcomer, the conqueror.

When we do not seek our own vengeance, stepping out of the way and allowing God to administer righteousness, the Lord is free to move and bring justice.

When we seek our own revenge we stand between God and our adversary and both of us come under judgement.

If neither of us will forgive the other, there is a danger that both will be destroyed.

But if ye bite and devour one another, take heed that ye be not consumed one of another (Galatians 5:15).