This book never gets old and it’s ideas stand as fundamentals in most of the success stories you hear every day.
Here is a good article explaining what resides in it:
http://uk.businessinsider.com/napoleon-hill-think-and-grow-…
When reading or listening to it I suggest keeping an open mind as it’s message it’s not always straight forward.
You will be surprised of how often you will hear speakers quoting or talking about it.