As a Man Thinketh is a literary essay of James Allen, published in 1902. The title is influenced by a verse in the Bible from the Book of Proverbs chapter 23 verse 7, “As a man thinketh in his heart, so is he.” The main concepts of this book as as follows:

* Men do not attract what they want, but what they are.
* A man is literally what he thinks, his character being the complete sum of all his thoughts.
* Cherish your visions. Cherish your ideals. Cherish the music that stirs in your heart, the beauty that forms in your mind, the loveliness that drapes your purest thoughts, for out of them will grow all delightful conditions, all heavenly environment, of these, if you but remain true to them your world will at last be built.
* The soul attracts that which it secretly harbors, that which it loves, and also that which it fears. It reaches the height of its cherished aspirations. It falls to the level of its unchastened desires - and circumstances are the means by which the soul receives its own.
* Men are anxious to improve their circumstances, but are unwilling to improve themselves, they therefore remain bound.
* Every action and feeling is preceded by a thought.
* Right thinking begins with the words we say to ourselves.
* Circumstance does not make the man, it reveals him to himself.
* You cannot travel within and stand still without.
* As the physically weak man can make himself strong by careful and patient training, so the man of weak thoughts, can make them strong by exercising himself in right thinking.
(Introduction by Wikipedia)