by William Walker Atkinson (Author), Three Initiates (Author)

Known as "the master key" and Dedicated to Hermes Trismegistus, « Master of Masters , this book explains the "science" of spirit and outlines seven universal principles: Mentalism, Correspondence, Vibration, Polarity, Rhythm, Cause and Effect, and Gender. It clarifies the principles behind all religions and philosophies, and redefines the nature of reality and the supersensible universe.