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“Speak when you are angry and you will make the best speech you will ever regret.”
― Ambrose Bierce

“The best fighter is never angry.”
― Lao Tzu

“ليس الشديد بالصرعة؛ إنما الشديد الذي يملك نفسه عند الغضب
The strong person is not the good wrestler. Rather,the strong person is the one who controls himself when he is angry.
(Sahih al-Bukhari, Book 73, #135)”
― Anonymous

“Anybody can become angry — that is easy, but to be angry with the right person and to the right degree and at the right time and for the right purpose, and in the right way — that is not within everybody's power and is not easy.”
― Aristotle