I found a book called A Course in Miracles years ago and it changed the way I see the world. It has daily lessons for a year which helps to release all your fixed beliefs that hurt you. It is highly spiritual and basically takes the teachings of forgiveness, non-judgement and love to the extreme.
I also like Deepak Chopra and Byron Katie. In the end I find they all say the same thing, but A course in Miracles is the deepest. most beautiful book I have ever come across. I think it saved my life.