The Master Key System - Charles F. Haanel

The Master Key System can easily be ranked as one of the best books ever written on the Law of Attraction and the power of thought. This is far more than a book however, it's a twenty-four week study course on prosperity, metaphysics and the step-by-step development of personal power. I found this book so compelling because it's a factual presentation without any excess hyperbole. Each chapter is concluded with a number of thought-provoking questions followed up by succinct and pithy answers.