As a Man Thinketh is life changing self-help book by James Allen, published in 1903. It is a great book if you wish to change your ways of thinking and come to the realization that your thoughts govern and produce results within your life.
It described by Allen as dealing with the power of thought, and particularly with the use and application of thought to happy and beautiful issues. I have tried to make the book simple, so that all can easily grasp and follow its teaching. put into practice the methods which it advises. 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. You can download from below and buy from amazon if you want.