This book had a profound effect on my life when I read it, as it opened my eyes in so many ways. Within it is a chapter on "forgiveness" (i.e. Chapter 7) that is, in my view, the best content I have ever read on the subject.
This quote from that chapter was perhaps the most important passage in the book for me to encounter at that moment of my life: "Follow this logic. Someone has harmed you in some way in your past. You feel hurt and angry, and that anger ultimately turns to hatred. This is your hatred. You own it. It is you and you are it. The hatred is all thought, and is with you wherever you go. You have given someone permission not only to hurt you once, but to continue controlling your inner life. The hatred infects your life while the other person is still on his or her path doing exactly what he or she knows how to do, independent of your current miserable state."