Matthew Ferry has put together a great compilation of the principles from great writers regarding the topic of personal development. I highly recommend this book and the tape series that compliments it. He very deftly explains how to "get out of our own way" and let our natural talent and strengths prevail.
For anyone in sales this is must read and listen, and who among us is not in sales???
From housewives, teachers, to ministers, family members, and people from all walks of life are all sales people by virtue of the fact that we all are communicating principles, habits, ideas, ethics, etc. to everyone we interact with.
Since everyone is communicating ideas to someone else, we all are "selling" in one way or another. The resources mentioned above go a long way to make our communications more effective and fruitful.