Think and Grow Rich is a 1937 motivational personal development and self-help book by Napoleon Hill. While the title implies that this book deals 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.

In  1908, Napoleon Hill met Andrew Carnegie, who was one of the most powerful men in the world. Hill discovered that Carnegie believed that the process of success could be outlined in a simple formula that anyone would be able to understand and achieve. Impressed with Hill, Carnegie asked him if he was up to the task of putting together this information, to interview or analyze over 500 successful men and women, many of them millionaires, in order to discover and publish this formula for success.

Jim Murray wrote that Think and Grow Rich was credited for Ken Norton’s boxing upset of Muhammad Ali in 1973. The Reverend Charles Stanley writes, “I began to apply the principles of (Think and Grow Rich) to my endeavors as a pastor, and I discovered they worked!”  The book was first published during the Great Depression.

At the time of Hill’s death in 1970, Think and Grow Rich had sold more than 20 million copies and by 2011 over 70 million copies had been sold worldwide. It remains the biggest seller of Napoleon Hill’s books. BusinessWeek Magazine’s Best-Seller List ranked it the sixth best-selling paperback business book 70 years after it was published.