Those who spend in prosperity and adversity, and those who suppress anger and pardon men; and Allah loves those who do good; And those who, when they commit a foul deed or wrong themselves, remember Allah and implore forgiveness for their sins – and who can forgive sins except Allah? – and do not persist knowingly in what they have done.
Islam, The Holy Qur’an, 3:135-136
Abu Hurairah (ra) reported that the Holy Prophet (sa) said, ‘The strong man is not the good wrestler; the strong man is only he who controls himself when he is angry.’
Islam, The Holy Prophet (sa), Hadith of Sahih Al-Bukhari and Muslim
If you wish to inherit pure knowledge, do not utter anything out of anger, for such a thing would be empty of wisdom and true understanding.
Islam, The Promised Messiah (as), The Essence of Islam, Volume 4, p. 298
He who is slow to anger is better than the mighty, and he who rules his spirit than he who takes a city.
Christianity, The Bible, Proverbs 16:32
Anger deprives a sage of his wisdom, a prophet of his vision.
Judaism, Talmud, Pesahim 66B
If an evil man, on hearing of what is good, comes and creates a disturbance, you should hold your peace. You must not angrily upbraid him; then he who has come to curse you will merely harm himself.
Buddhism, Sutra of Forty-Two Sections 7