William James

“Most people live, whether physically, intellectually, or morally, in a very restricted circle of their being. They make use of a very small portion of their possible consciousness, and of their soul’s resources in general, much like a man who, out of his whole bodily organism, should get into the habit of using and moving only his little finger. Great emergencies and crises show us how much greater our vital resources are than we had supposed.”

William James