Attributed to Colin Powell (Chairman of the US Joint Chiefs of Staff, US Secretary of State). Interesting post written by Bruno Gideon titled Get mad, then get over it …
“Being angry is okay as long as it is temporary. My advice to you is: to get mad, then get over it. If you let your feelings continue, they will boomerang and hurt you. Don’t suppress the emotion; allow it to come to the surface, try to analyze it, and then let go.”
Life's Best Advice 