Within You is a Master Key That Solves Every Human Problem and Leads to Incredible Heights of Achievement In one of success master Napoleon Hill's greatest books, The Master Key to Riches, he explores how to unlock the miraculous energies of thought-and explores why motivated people often fail to do so. In this powerful lesson-distilled down to its essentials and introduced by PEN Award-winning historian and New Thought scholar Mitch Horowitz-you...