Think and Grow Rich - Napoleon Hill
Unbelievable book. The version I read was an old one - I think there are updated versions now available. Simply brilliant. Buy it now.
The version I read was hopelessly out of date in some parts (I'm talking about the bits referring to the Depression) but the advice, the stuff that tells you what to do and explains how important your attitude is, is right on the money.
You should find lots of the concepts familiar from other courses you've been on. Persistence, thinking positive. Very much a book ahead of its time. Or perhaps this book merely proves that these ideas are not new - we just all need to learn them just like they did back then!