Intolerance is the product of anger, hate and envy. Try your best to suppress the first appearance of anger. It does not come upon you unaware. The body becomes warm, the lips twitch, the eyes redden – so, when you get the intimation, drink a glass of cold water, sip it slowly, close the door and relax until the seizure passes away, and you laugh at your folly. This may appear difficult, but you have to practice it, for, the consequences of your yielding to anger will be so disastrous that you will have to repent long for them.
(From : Sai Veda, The Word of God, sayings of Bhagavan Sri Sathya Sai Baba)