The book Principle Centered Leadership by Stephen Covey is a waste of your money. It is one of those self help books which just keep saying "With (insert technique) you can change your life" over and over without explaining (insert Technique) very well. Obviously the book was written to make more money off of Seven Habits of Highly Effective People, also by the same author.
I bought it at the George Bush International Airport in Houston cause of a flight delay (which I will explain some other time), and it was a waste of good money.
Go see the new Die Hard movie instead.