The Prophetic traditions are firmly established.
Avoid anger.
Abu Hurairah (may Allah be pleased with him) reported
that a man said to the Prophet (peace and blessings of Allah be upon him),
"Advise me."
He replied, "Do not become angry."
The man repeated his request several times,
and he kept saying, "Do not become angry."
It was narrated by al-Bukhari.