Think and Grow Rich is a motivational personal development and self-help book written by Napoleon Hill and inspired by a suggestion by Scottish-American businessman Andrew Carnegie. It was published in 1937 during the Great Depression. It remains the biggest seller of Napoleon Hill’s books, selling a claimed 30 million copies over the next 70 years (although Alice Payne Hackett’s 70 Years of Best Sellers suggests the figure was lower).

The text of Think and Grow Rich is founded on Hill’s earlier work The Law of Success, the result of more than twenty years of research based on Hill’s close association with a large number of individuals who achieved great wealth during their lifetimes. At Andrew Carnegie’s bidding, Hill studied the characteristics of these achievers and developed 15 “laws” of success intended to be applied by anybody to achieve success. Think and Grow Rich condenses these laws further and provides the reader with 13 principles in the form of a philosophy of personal achievement.

In every chapter of this book, mention has been made of the money-making secret which has made fortunes for hundreds of exceedingly wealthy men whom I have carefully analyzed over a long period of years. The secret was brought to my attention by Andrew Carnegie, more than half a century ago. the canny, lovable old Scotsman carelessly tossed it into my mind, when I was but a boy. Then he sat back in his chair, with a merry twinkle in his eyes, and watched carefully to see if I had brains enough to understand the full significance of what he had said to me. When he saw that I had grasped the idea, he asked if I would be willing to spend twenty years or more preparing myself to take it to the world, to men and women who, without the secret, might go through life as failures. I said I would, and with Mr. Carnegie’s cooperation, I have kept my promise. – Napoleon Hill, 1928

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