Anger ventilated often hurries towards forgiveness; anger concealed often hardens into revenge.

Anger spoken out loud tends to spend itself. Once said, it loses its charge, and what is left is closer to the plain hurt underneath. Anger you swallow does not disappear. It keeps working in private, and privacy is where it builds a case in which you are owed something.

Notice which resentments you have never said to anyone. Those are the ones that harden. Saying it once, plainly, to the person or to a friend you trust, usually lets out enough heat that you can think again.