"The longer I live, the more I observe that carrying around anger is the most debilitating to the person who bears it."
A very true statement. We carry these things around as if it were a badge of honor. Often the other person doesn't even have a clue as to why we are mad in the first place. So this anger that is for someone else never reaches it's target, it stays with us ruining our lives. Letting go of the pain and anger is the best thing that we can do for ourselves, only after that can we heal and move on.