As an avid reader of diverse subject matters, I found this book riveting. In fact, have just re-read it after several months. No, there may be little proof for many of his theories other than that of the reader's gut experience. (My gut says yes, yes, yes.) Yet, all of my reading (some of which he concisely covered) ties together in fascinating ways with this information. As with most metaphysical experience, you may not be able to prove it, but can you DISprove it? Drunvaloe's style is conversational while interlacing vast stores of knowledge and experience into fascinating, educational and digestible form. Can't wait to receive Volume two.