Suppose that even though an old enemy dies, you continue to feel hatred towards him. In time that bitterness will produce ill effects in your own body and mind. It is better to concentrate on trying to behold God in your enemy; for by doing so you release yourself from evil vengeful desires that destroy your peace of mind. By heaping hatred upon hatred, or giving hate in return for hate, you not only increase your enemy’s hostility towards you; you poison your system, physically as well as emotionally, with your own venom.
Extract from the book “Man’s Eternal Quest” by Sri Sri Paramahansa Yogananda.