Anger cannot be overcome by anger. If a person shows anger to you, and you show anger in return, the result is a disaster. In contrast, if you control your anger and show its opposite--love, compassion, tolerance, and patience--then not only will you remain in peace, but the anger of others also will gradually diminish. No one can argue with the fact that in the presence of anger, peace is impossible. Only through kindness and love can peace of mind be achieved.
...human beings can judge and reason; we understand consequences and think in the long term. It is also true that human beings can develop infinite love.... However, when humans become angry; all of this potential is lost. No enemy armed with mere weapons can undo these qualities, but anger can. It is the destroyer.
If you look deeply into such things, the blueprint for our actions can be found within the mind. Self-defeating attitudes arise not of their own accord but out of ignorance. Success, too, is found within ourselves. Out of self-discipline, self-awareness, and clear realization of the defects of anger and the positive effects of kindness will come peace---How to Expand Love: Widening the Circle of Loving Relationships