Think and Grow Rich is a motivational personal development and self-help book written by Napoleon Hill and inspired by a suggestion from Scottish-American businessman Andrew Carnegie. While the title implies that this book deals only with how to get rich, the author explains that the philosophy taught in the book can be used to help people succeed in all lines of work and to do or be almost anything they want
Be prepared, therefore, when you expose yourself to the influence of this philosophy, to experience a changed life which may help you not only to negotiate your way through life with harmony and understanding, but also to prepare you for the accumulation of material riches in abundance. Teaching, for the first time, the famous Carnegie formula for money-making, based upon the thirteen proven steps to riches.
Napoleon Hill's works examined the power of personal beliefs, and the role they play in personal success. "What the mind of man can conceive and believe, it can achieve" is one of Hill's hallmark expressions. How achievement actually occurs, and a formula for it that puts success in reach for the average person, were the promise of Hill's books.