In fact, I have no background on the concept of spirit, and the book actually talked about it in terms of how to reach out your spiritual Intelligent.
What I understood with my journey in reading this book was that many people confuse between religion and spirit. Religion is the set of believes. Whereas Spirit is the non-physical part of you.
The more you understand spirit is the more you understand yourself, the world around you, and become more creative.
I think that this is a good book but not a great book.