2"As a Man Thinketh" is a literary essay by James Allen, first published in 1902.

In more than a century it has become an inspirational classic, selling millions of copies worldwide and bringing faith, inspiration, and self healing to all who have encountered it. The title comes from the Bible: "As a man thinketh in his heart, so is he." -- Proverbs, chapter 23, verse 7

As himself Allen describes, "It shows how, in his own thought-world, each man holds the key to every condition, good or bad, that enters into his life, and that, by working patiently and intelligently upon his thoughts, he may remake his life, and transform his circumstances. ...and it can be carried in the pocket."