Here is another summary, which I recommend: http://becomingeden.com/summary-of-a-guide-to-the-good-life/

I tried to read the book. It's a long read and the author shows the reader all of his thought processes. Example: The chapter about negative visualization goes back and forth for a while, almost as if you needed even more convincing.

But the concept of negative visualization isn't really that hard to grok, the benefits are obvious to a somewhat intelligent reader and quite intuitive and easy to implement from a summary. No lengthy convincing required.

Edit: Clarification.