"Speak when you are angry and you will make the best speech you will ever regret."
Ambrose Bierce

"He who angers you conquers you." Elizebeth Kenny

Holding on to rage is like grasping a hot coal with the intent of hurling it at someone else; you are the one who gets scalded. Learn how to control it, and you will succeed in life. Keeping vexed thoughts in your mind does not really matter much, but venting your fury by actions is outrageous and never sufferable.