Holding on to anger is like grasping a hot coal with the intent of throwing it at someone else; you are the one who gets burned.
1.
The discretion of a man deferreth his anger; and it is his glory to pass over a transgression.
2.
A fool uttereth all his mind: but a wise man keepeth it in till afterwards.
3.
Wherefore, my beloved brethren, let every man be swift to hear, slow to speak, slow to wrath:
4.
For the wrath of man worketh not the righteousness of God.