Think and Grow Rich was written by Napolean Hill promoted as a Personal development and self-improvement book. He writes that he was inspired by a suggestion from Business magnate and later-philanthropist Andrew Carnegie.
In the original Think and Grow Rich, Hill draws on stories of Andrew Carnegie, Thomas Edison, Henry Ford, and other millionaires of his generation to illustrate his principles. For more than a decade, the author interviewed some of the wealthiest and most successful people in the world. It was based on what author learnt in the process from all these people, when asked about how they achieved not just great riches but also personal wellbeing.
The author formulated hundreds and thousands of answers, into concise principles which when acted upon, many claim, can help one achieve unprecedented success. The author has in many places narrated short stories and examples that help explain the concept at hand in an engaging manner. Think and Grow Rich teaches not just concepts but also methods. Till date, it remains the number one self-help book in the world, as far as sales are concerned!