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)
Human anger is a higher thing than what is called divine discontent. For you must be angry with something; but you can be discontented with everything.
One cannot completely get rid of the six passions: lust, anger, greed, and the like. Therefore one should direct them to God. If you must have desire and greed, then you should desire love of God and be greedy to attain Him.
Happiness cannot come from hatred or anger. Nobody can say, 'Today I am happy because this morning I was angry.' On the contrary, people feel uneasy and sad and say, 'Today I am not very happy, because I lost my temper this morning.'
With everything we do in life we identify ourselves. Here is a man who says harsh words to me. I feel anger coming on me. In a few seconds anger and I are one, and then comes misery. Attach yourselves to the Lord and to nothing else, because everything else is unreal. Attachment to the unreal will bring misery. There is only one Existence that is real, only one Life in which there is neither object nor [subject].
Be advised; Heat not a furnace for your foe so hot That it do singe yourself: we may outrun, By violent swiftness, that which we run at, And lose by over-running. Know you not, The fire that mounts the liquor til run o'er, In seeming to augment it wastes it?