As a Man Thinketh, first published in 1903, remains one of the most powerful, popular, and beloved books in the self-help movement.

Its author, James Allen (1864–1912), published nineteen books in his lifetime, beginning with From Poverty to Power, published in 1901. But none of his other works have had the inspirational force of As a Man Thinketh. The title comes from Proverbs 23:7: “As he thinketh in his heart, so is he.” It is the central theme of his book—and perhaps the most important truth about life.

In clear, concise, and noble language, Allen overturns the conventional view of reality—that human beings are nothing more than creatures of circumstance and environment. Instead, he reminds us, everything around us, good and bad, arises from the disposition of our hearts and minds. “The visible is sustained by the invisible,” he writes, reminding us of the central fact of our existence: that what we think and believe forms the core of our habits, character, and even fate.

Allen stresses the importance of a central purpose in life. He writes, “Until thought is linked with purpose there is no intelligent accomplishment. . . . They who have no central purpose in their life fall an easy prey to petty worries, fears, troubles, and self-pityings. . . . Those we are not prepared for the apprehension of a great purpose should fix their thoughts upon the faultless performance of their duty.”

This inspirational classic reminds us of the eternal truth that both success and happiness are the fruits of noble, elevated thoughts matched with corresponding action.

As a Man Thinketh has long been a consolation and an inspiration for those who struggle, hope, and persist. Over 100 years after it first appeared, it has lost none of its wisdom or power. It reminds us of certain central truths of life which none of us can hear too often.