Before a man accomplish anything of an enduring nature in the world he must first of all acquire some measure of success in the management of his own mind. This is as mathematical a truism as that two and two are four, for, “out of the heart are the issues of life.” (Here Allen is referring to Proverbs 4:23). If a man cannot govern the forces within himself, he cannot hold a firm hand upon the outer activities which form his visible life. On the other hand, as a man succeeds, in governing himself he rises to higher and higher levels of power and usefulness and success in the world.
James Allen
LifeBrook 