you cannot forget until you forgive

Was just about to sleep .wanted to write something that's ringing in mind for some hours now.why not through it out now ?
               I find most of the  people having strife, bitterness inside just because of some "X" reason carrying it where ever they go.which actually leads to high levels of frustration ends up killing their day or days. I understand its such pain letting it go .But one has to let it go to save his life, showing respect to those who gave us such great life to live and to make them happy.