William James continues,
“the human individual lives usually far within his limits; he possesses powers of various sorts which he habitually fails to use. He energizes below his maximum, and he behaves below his optimum.”
“Of course there are limits,” James acknowledged. “The trees don’t grow into the sky.” But these outer boundaries of where we will, eventually, stop improving are simply irrelevant for the vast majority of us: “The plain fact remains that men the world over possess amounts of resource, which only very exceptional individuals push to their extremes of use.