I read The Eternal Validity of the Soul first. Beautifully, poetically written. Being that I already knew there were realities existing right along side this one . It was easy for me to read. I think this is the book where Seth tells us “There Are NO Closed Systems”. Meaning that even though we are physiologically and psychologically set up to operate in this plane of existence the other systems, planes of existence are not closed to us. A great deal of our creativity lies in these other plane of existence. In the 2nd book The Nature of Personality Seth explores these subjects further. Seth tells us these books will just remind us of what we already knew! That they did!