I know, to banish anger altogether from one's breast is a difficult task. It cannot be achieved through pure personal effort. It can be done only by God's grace.
Do you recall the story of the young Yogi in the Mahâbhârata who prided himself on his psychic powers by burning the bodies of a crow and crane by his intense will, produced by anger?
Evil company is always to be shunned; because it leads to lust and anger, illusion, forgetfulness of the goal, destruction of the will (lack of perseverance), and destruction of everything. (Narada Bhakti Sutra)
She speaks poniards, and every word stabs: if her breath were as terrible as her terminations, there were no living near her; she would infect to the north star. I would not marry her, though she were endowed with all that Adam bad left him before he transgressed.
Those who are not angry at the things they should be angry at are thought to be fools, and so are those who are not angry in the right way, at the right time, or with the right persons.
Compassion is not against anger. When anger disappears, compassion is. Compassion is not to be fought for; it is not against passion. When passion disappears, compassion is. Compassion is your nature.
Of ill-temper there are three kinds: irascibility, bitterness, sullenness. It belongs to the ill-tempered man to be unable to bear either small slights or defeats but to be given to retaliation and revenge, and easily moved to anger by any chance deed or word. Ill-temper is accompanied by excitability of character, instability, bitter speech, and liability to take offence at trifles and to feel these feelings quickly and on slight occasions.
Try to understand why it is happening, from where it is coming, where the roots are, how it happens, how it functions, how it overpowers you, how in anger you become mad. Anger has happened before, it is happening now, but now add a new element to it, the element of understanding -- and then the quality will change. Then, by and by, you will see that the more you understand anger, the less it happens. And when you understand it perfectly, it disappears. Understanding is like heat. When the heat comes to a particular point -- one hundred degrees -- the water disappears.