Psycho-Cybernetics from Maxwell Maltz.

Basically, this man was a plastic surgeon and noticed that some patient's lives changed dramatically after their surgery, yet others continued to act as if they'd never had the surgery. So he decided that there must be more to it than touching up a person's physical appearance, and the book is the findings according to the subsequent studies he made into the human psyche.

Fantastic book, since there isn't anyone to whom it is not relevant.