The first quote that i heard about anger when I was a still a kid was probably....
Anger is only one letter short of danger
Today i was reading an article by Shaikh Tosun Bayrak al-Jerrahi
Adapted from the ‘Marifetname’ of Hd. Ibrahim Hakki Erzurumi (1703-1780) regarding seven stages of 'nafs' as mentioned in sufism('tasawwuff')...It is beautiful article .. the following lines caught my attention...
The negative emotion of anger, when it flares up, is faster than the rational effort to suppress it. Once anger has caught fire it is difficult to extinguish. Like fire, it burns all that is human in us; compassion, love, gentleness, generosity, the ability to communicate, to think of consequences, and intelligence are all reduced to ashes. All that remains is a dangerous wounded wild animal.
Ambrose Bierce tries to use reverse psychology when quoting
Speak when you are angry and you will make the best speech you will ever regret.
Another thought I like about anger is
He who angers you conquers you.
basically anger is nothing but the reflection of the arrogance living within us... and it is said that the cure of this arrogance is the realization that all you have, including your body and your very life, is not yours, but lent to you and entrusted to you by your Creator. Your actions are also His if they are good, and when they are bad, it is you who are tyrannizing yourself. Offer thanks for everything, and feel shame your wrongdoings; then you will be humble.
The fall of the one who stands low is much less painful than the one who falls from high ...