His book holds the secret of a powerful system of success, which was used by the author, Charles F. Haanel to amass a fortune for himself. The Master Key System lays down the foundation of the principles of creative manifestation through the Law of Attraction. The Master Key System was among the first books to use the phrase Law of Attraction, which has become such a popular term today when referring to the most powerful force in the universe. You will learn how to develop and use the creative instrument of your mind