It has been said that "The Master Key System", by Charles F. Haanel, published in 1918, is the only clear, concise, comprehensive, definitive, distinctive, cogent, and scientific presentation, of the "Creative Power of Thought" ever presented by any person at any time - past or present.

Haanel gave the Master Key to the world as a means of tapping the great Cosmic Intelligence and attracting from it that which corresponds to the ambitions, and aspirations of each reader.

The Master Key teaching was published in the form of a Correspondence Course of 24 weekly lessons.

The reader is advised not to attempt to read the book like a novel, but to treat it as a course of study and conscientiously to imbibe the meaning of each part - reading and re-reading one part only per week before proceeding to the next. Otherwise the later parts will tend to be misunderstood.

Used as instructed "The Master Key" will make of the reader a greater, better personality, and equipped with a new power to achieve any worthy personal purpose and a new ability to enjoy life's beauty and wonder.