No man can hope to accomplish anything great in this world until he throws his whole soul, flings the force of his whole life, into it. It is not enough simply to have a general desire to accomplish something. There is but one way to do that; and that is, to try to be somebody with all the concentrated energy we can muster.

He Can who Thinks He Can: And Other Papers on Success in Life (ed. Prabhat Prakashan, 1935)