If we don't forgive ourselves for our mistakes, and others for the wounds they have inflicted upon us, we end up crippled with guilt. And the soul cannot grow under a blanket of guilt, because guilt is isolating, while growth is a gradual process of reconnection to ourselves, to other people, and to a larger whole.
I remember being a kid and seeing the 'National Inquirer' at the grocery store checkout line. When somebody actually picked up a copy, it was mortifying. You felt dirty for them. But now it's perfectly acceptable to read something like that. There's absolutely no taboo surrounding that kind of exploitation.