The first step is to become aware when your mind is becoming disturbed, when you are feeling threatened or angry. As soon as anger begins to arise, you need to recognize it. Once you are aware of it, you then consciously and systematically recollect its shortcomings: Anger never brings the slightest benefit or happiness to you or to others; anger brings only harm, making you unhappy, disturbed, even vengeful and vicious. When you allow yourself to be controlled by anger, that anger deeply affects your mind; it leaves an imprint on your mind, and the next time you meet similar conditions, anger easily arises again out of habit.
Transforming Problems into Happiness
Thubten Zopa
Cattāri Brahmavihārā 
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