Napoleon Hill wrote books much more powerful! We miss the experience of concrete in this book and I think that is what makes the strength of this kind of book Jai loved two books that brings us what we all seek happiness, health and success !!! Clearly and concretely! Hill has written a book that few know and that has been hidden for years. "Smarter than the devil" The second is that of Frederick DELTOUR, "Listen to your heart and live your dreams! "A man whose life is all these concepts and in addition it gives us practical methods to achieve these goals. An example to follow 2 books to read.