The Master-Key to Riches , a powerful formula for self-improvement, shows you how to harness the powers of your will and mind so that you can achieve mental happiness, business success, spiritual vitality and financial superiority.   Millions of readers all over the world are grateful to Dr. Napoleon hill for his now classic Think and Grow Rich. provides the key to why some people become successful and how you can become one of them. The Master Key is a marvelous device which, once discovered, may be used to: Open the door to sound health Reveal the method by which every disadvantage and disappointment can be turned into advantages of priceless value Open the door to love and romance Renew the spirit of youth Lift humble men to positions of power, fame and fortune Based on the Andrew Carnegie formula for money making, The Master Key to Riches describes in step-by-step detail the greatest practical philosophy of success. “Riches means all riches—not merely those represented by bank balances and material things,” says Napoleon Hill in the introduction to this master-manual for personal achievement.   This amazing philosophy, culled from the success experiences of many of the world’s most powerful and wealthy men, will show you how to succeed in any path of life, whether it be love, wealth, personal satisfaction, faith, or any number of other goals.   The material woven by Napoleon Hill into has the endorsement of many men whose names have become synonymous with great achievement in the fields of industry, finance and statesmanship.