This is one of the best-selling self-help books of all time. Written during the Great Depression, against a backdrop of millions of people out of work and a looming world war, Napoleon Hill's magnum opus held out hope that life could get better. While not considered part of the New Thought movement, Hill drew on many of their concepts and techniques. He prefigured the 'Prosperity Consciousness' of present-day New Age thinkers. And a host of motivational writers and speakers have followed in his footsteps.