Dyers history

Hi. I read Your Erroneous Zones, and then turned to the internet to find other stuff of Wayne Dyer. It seems to me that there has been a drastic change in his way of looking at life? Or has he had the "source"-view from the start? It seem like it started about effectiveness and so for all people, but now one has to embrace the source to get something of of it?

From what I understand, he was a psychology student and teacher. I think through living he has aquired his beliefs and current philosophies. He has a book on the Tao coming out, which is a huge shift from "you can do it" way of thinking. The Tao is about letting things resolve themselves, as nature does.