Exorcising the Tree of Evil is an exploration of the nature of good and evil, as well as the Quiploth. I found the book to be insightful and liked how the author explored the nature of evil in depth and showed how it related to the Quiploth as well as to the Tree of Life. What I found invaluable is how the author explored the different types of evil and where they show up in the quiploth as well as how they show up in a person's life. This book will give you a lot to think about in relationship to your own life and magical work. Gray also provides some useful exercises for exorcising the evil within as well as appropriate cautions about changes in behavior and how to handle them. My one complaint about the book actually has to do with the editing and layout. This is a reprint and yet there are some typos that show up throughout the book, which surprises me, given how exact Gray is about his work. I suspect this is more of an editor/publisher error than that of the author. Overall though this book is a must read for Quabalists, ceremonial magicians, and anyone serious about their spiritual development.