I knew I liked William James
Most people live...in a very restricted circle of their potential 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 a habit of using only his little finger.
William James, The Varieties of Religious Experience (1901)
From Rolf Potts at Vagabonding