This engaging book describes how there is actually only one soul... and how the illusion that many souls seem to exist came about. Wolf sets out to show how the self is fundamentally an illusion, "arising as a reflection of the soul in matter much as a clear lake at midnight reflects the moon." Wolf begins this book with descriptions of Aristotlian and Platonic Soul Physics... and then continues the quest for knowledge of the soul through ancient Egypt and ancient Chaldea, and onward through more modern history. Wolf shares his vision of the soul as a process rather than some "thing" measurable in terms of mechanical materiality -- drawing from Qabalistic, Buddhist, and Christian wisdom as well as a thorough understanding of physics to redefine spirit, soul, matter and self. I found this entire book to be deeply thought-provoking, with Wolf's characteristic playful humor entertaining me throughout. I especially enjoyed the section of THE SPIRITUAL UNIVERSE that described the importance of secret knowledge, and why it is sacred -- thereby showing us the physics of faith.