wrath and anger can be really destructive in case they exceed the limit of intellect and religion and wrath is referred to as the key to any evil in Islamic traditions (Ahadith). The Messenger of Allah (pbuh&hp) says: wrath rots the faith as the vinegar ruins the honey. The commander of the faithful, Imam Ali (as) says: “Protect yourself from anger for its beginning is insanity and its end is remorse.” on the other hand, suppressing anger is empathetically recommended by the holy Quran and the narrations of the Infallible Imams, and this is the moral and practical tradition of the leaders of the religion.
source : erfan.ir