A few cynical views written here which is disappointing. However, MANY ancient teachings of most belief systems will say the same thing about creating or manifesting things in to your life.
I like Dr Dyer's work, always have done. I don't think that he has changed due to illness at all, he has always held these beliefs. The thing that I know, is that when I practice them - I get very positive changes and results - never fails, no matter what the circumstance, either minor or dire, it works for me. I have 40 yrs of experience at it.
The book does talk about his personal experiences among those of others, and that is fine by me.