10 Key Principles that are common to over 100 of the most famous Personal Development books... Brian Johnson discovered these Concepts for Optimal Living and wrote a book about it:

A Philosopher's Notes: On Optimal Living, Creating an Authentically Awesome Life and Other Such Goodness, Vol. 1

http://www.amazon.com/Philosophers-Notes-Creating-Authentica...

This is the best Personal Development Book I ever read.