In this book there will be nothing said concerning metaphysical theories or philosophical hypotheses; instead, there will be a very strict adherence to the principles of psychology. There will be nothing said of ''spirit'' or "soul''; but very much said of "mind." There will be no speculation concerning the question of "what is the soul," or concerning "what becomes of the soul after the death of the body." These subjects, while highly important and interesting, belong to a different class of investigation, and are outside of the limits of the present inquiry. We shall not even enter into a discussion of the subject of "what is the mind"; instead, we shall confine our thought to the subject of "how does the mind work." The individual of the Master Mind is indeed a MASTER of his mental machinery, and is able to turn out a mental product of the highest quality and degree of efficiency. And, thus being the Master of himself, he becomes the Master of much in the outside world. To the Master Mind, even circumstances seem to come under conscious control and management; and other men and women seem to be ready to accept direction and control from such a masterful mentality. The Master Mind creates a world for itself, in which it dwells supreme, and to which it attracts and draws that which is conducive to its welfare and happiness, its success and achievement. You are invited to become a Master Mind. Will you accept the invitation? If so, you will carefully study the principles herein explained, and apply the methods herein set forth and described.