Many centuries ago a very wealthy and wise philosopher by the name of Croesus, an adviser to Cyrus, King of the Persians, said: ''I am reminded, O King: and take this lesson to heart; that there is a Wheel on which the affairs of men revolve, and its mechanism is such that it prevents any man from being always fortunate.'' There is a Wheel of Life that controls the destiny of men! It operates through the power of thought. The Master Key to Riches was designed for the purpose of aiding men in the mastery and control of this great Wheel, to the end that it may be made to yield them an abundance of all that they desire... CONTENTS THINK I. THE BEGINNING OF ALL RICHES . . . II. THE TWELVE RICHES OF LIFE . . . III. THE EIGHT PRINCES . . . IV. DEFINITENESS OF PURPOSE . . . V. THE HABIT OF GOING THE EXTRA MILE . . . VI. LOVE, THE TRUE EMANCIPATOR OF MANKIND . . . VII. THE MASTER MIND . . . VIII. ANDREW CARNEGIE'S ANALYSIS OF THE MASTER MIND PRINCIPLE . . . IX. APPLIED FAITH . . . X. THE LAW OF COSMIC HABITFORCE . . . XI. SELF-DISCIPLINE . . .