The Master Key System
The Master Key System is a personal development book by Charles F. Haanel (1866-1949) that was originally published as a 24-week correspondence course in 1912, and then in book form in 1916. The ideas it describes and explains come mostly from New Thought philosophy. It was one of the main sources of inspiration for Rhonda Byrne's film and book The Secret (2006). The Master Key System describes man's unity with God, and teaches the importance of truth, harmonious thinking and the ability to concentrate. Purchase the Audio Version today and we'll send you the PDF version absolutely FREE. Change Your Thinking And Change Your World.