Yet so blind and dead does the clamor of our own practical interests make us to all other things, that it seems almost as if it were necessary to become worthless as a practical being, if one is to hope to attain to any breadth of insight into the impersonal world of worths as such, to have any perception of life's meaning on a large objective scale. Only your mystic, your dreamer, or your insolvent tramp or loafer, can afford so sympathetic an occupation, an occupation which will change the usual standards of human value in the twinkling of an eye, giving to foolishness a place ahead of power, and laying low in a minute the distinctions which it takes a hard-working conventional man a lifetime to build up. You may be a prophet, at this rate; but you cannot be a worldly success.

-William James, "On a Certain Blindness"