This book is simply the best thing I've ever read on why some people have massive success and most people don't.
Five factors control how successful you'll be in life. (Here I'll define success as "how much money you earn." There are other ways to define success, but none of them are as objective as just counting dollars. It's certainly worth pursuing those other kinds of success, but let's stay focused on money here.) This book will teach you the factors that control your success, and it will show you what you can do to bump those factors in your favor. It's the best book ever on success.