“As a Man Thinketh” is a small book by James Allen that became a cornerstone of all the subsequent extensive and ever-growing “motivational literature”—books on personal development. Since it was published in 1902, “As a Man Thinketh” (“The Human Thinker”) has been regarded as a classic and foundational work on self-improvement. The main idea of the book is that thoughts shape a person: noble thoughts create a noble person, low thoughts make a person low. Translation from English by Yulia Shmatko.