وقال رجلٌ اَوْصِنى، فقال صلى الله عليه وآله وسلّم: لاتَغضَب، ثم أعادَ عليه، فقال: لاتَغضَب، ثمّ قال: ليس الشّديد بِالصّرَعَةِ*، انّما الشديدُ الذي يَملكُ نفسه عند الغضبِ

A man asked the Prophet (PBUH) to give him a piece of advice. The Prophet, may Allah's greetings be upon him and his immaculate household, said: ‘Control your temper. ‘The man made the same request for a second time. The Prophet said: ‘Control your temper.' Then, he went on to say: ‘A strong man is not one who knocks other people down. A strong person is one who does not let his anger get the better of him.'

(Tohfatul Oqul, p. 47)