The Secret of leading a successful life is no secret at all.Know where you want to be, set a goal to get there, and act on the goal.Here are three classic short books from a century ago that tap into the basic truth in ways that have inspired generations: "As A Man Thinketh" by James Allen, "Acres of Diamonds" by Russell H. Conwell, and "The Science of Getting Rich" by Wallace D. Wattles.Each in its own way has changed thousands of lives; together, they may change yours.