Anger is the fume of an irritated mind. It is caused by the thwarting of desires. It feeds the limited ego and is used for domination and aggression. It aims at removing the obstacles existing in the fulfillment of desires.
The frenzy of anger nourishes egoism and conceit, and it is the greatest benefactor of the limited ego. Mind is the seat of anger, and its expressions are mostly through activities of the mind. Anger is a form of entanglement with the mental sphere.
Lust, greed, and anger respectively have body, heart, and mind as their vehicles of expression.
Discourses, p. 11