James Allens classic AS A MAN THINKETH. The Bestselling Classic That Inspired "The Secret". AS A MAN THINKETH, Allen's most famous book, today is considered a classic self-help book. Its underlying premise is that noble thoughts make a noble person, while lowly thoughts make a miserable person. In "As a Man Thinketh," James Allen reveals how our thoughts determine reality. Whether or not we are conscious of it, our underlying beliefs shape our character,...