Imam As-Sadiq (a.s.) said:
مَنْ ساءَ خُلْقُهُ عَذَّبَ نَفْسَهُ
One who is ill-humored torments himself.1
It is usually said that ill-humored individuals who are peevish with everybody, torment and annoy their friends and relatives, while they themselves suffer the greatest torments because they embitter life’s honey and make pure water unpleasant for themselves.
Ill-humored people have a short life and an uneasy spirit, their body is in pain, and are prone to more sufferings than others.
Good temper is one of the qualities which Islam has emphatically recommended to its followers . It has been referred to as an important factor for attainment of the eternal paradise.