Compared with what we ought to be, we are only half awake. Our fires are damped, our drafts are checked. We are making use of only a small part of our possible mental and physical resources. The human individual lives far below his limits; he possesses powers of various sorts which he habitually fails to use. He energises below his maximum, and he behaves below his optimum.
The plain fact remains that men the world over possess amounts of resource, which only very exceptional individuals push to their extremes of use. William James