Woa! Difficult, dense,... mind blowing. If only I had the intellect to grasp this properly. A century ago, Ken Wilber would surely have been a "celebrity", hailed as one of our greatest intellectuals, like Jung or Freud or Neitzche but nowadays we worship a different kind of celebrity and you have to dig deeper for the ones who really matter. Other than online, I don't think I've ever heard him mentioned here in the UK. Worth effort though. A voice of common sense and unifying calm amid the polar opposites of religion and scientism. Do read this book. Even if you understand only one word in ten, it will surely be to your benefit. The World is mad, possibly it always has been, but lately we've seen how it's probably also completely screwed as well. Don't know how or why? Ken Wilber will help to make sense of it for you.