"To take revenge on trouble-makers is only to create more problems and disturbances. You must realise that negative feelings and hostile actions could only bring harm and suffering to both you and the trouble-maker. In order to take retaliatory action, you have to harbour intense hatred in your heart. This hatred is like a poison. Since the poison is initially in you, surely it will harm you before it can harm anyone else. Before you throw a blazing iron at another, you get burned first. Your action merely goes to show that there is no difference between you and your opponent.
By hating others, you only give them power over you. You do not solve your problem. If you become angry with a person who simply smiles back at you, then you will feel defeated and miserable. Since he did not cooperate with you to fulfill your wish, it is he who is victorious."
"We can live happily without fanning the fires of hatred. Perhaps you may not be strong enough to extend compassionate love to your enemies; but for the sake of your own health and happiness and that of everybody else, you must at least learn to forgive and forget."
~ Ven. Dr. K. Sri Dhammananda