Turn the Other Cheek; Get Slapped Twice
It seems obvious that striking back at an enemy is a gratifying but lower response than forgiving the trespass in the first place. A person who is able to overlook having been wronged demonstrates a higher form of moral sensitivity, by setting priorities that preclude a need to get back at someone else. That line of reasoning was given its classical formulation in the Christian Scripture, with the mandate to "turn the other cheek." If someone slaps you on one side of the face, rather than slapping back, simply offer your other cheek to be slapped.