« You have absolute control over but one thing, and that is your thoughts. This is the most significant and inspiring of all facts known to man. It reflects man’s divine nature. This divine prerogative is the sole means by which you may control your own destiny. If you fail to control your own mind, you may be sure you will control nothing else. If you must be careless with your possessions, let it be in connection with material things. Your mind is your spiritual estate! Protect and use it with the care to which divine royalty is entitled. You were given a willpower for this purpose.
The power of thought, depending on how it is used, is the most dangerous and the most beneficial force available to man. Through this power man has built great empires of civilization. Through the same power, other men have trampled down these empires like so many insignificant pieces of clay. By its application man rises to seize his opportunity. And through neglect or misuse of this same power, man has turned his back on opportunity, becoming a puppet of his environment, a slave to his circumstances.
Every creation of man, wether it be good or bad, is created first in a pattern of thought. All ideas, plans, and purposes are created in thought. As men search all their lives for worldly riches, they fail to realize that « the source » of all they would ever desire is already within their reach and under their control, awaiting only their recognition and use. Your only requirement for a productive, fulfilled life lies within the storehouse of your mind. If you will change your thinking, you will change your life. »
Dennis Kimbro and Napoleon Hill, Think and grow rich. A black choice: a guide to success for Black Americans, Ballantine books, 1991