'There must be something in the spirit of man - as it is not in the objects themselves - which prevents us from receiving the truth, not withstanding the brilliant light she diffuses, and from accepting her, for whatever might be her strength for producing conviction. This something was perceived and expressed by an ancient sage in this very significant maxim: Sapere aude.
Dare to be wise! A spirited courage is required to triumph over the impediments that the indolence of nature as well as the cowardice of the heart oppose to our instruction.'
Friedrich von Schiller, Aesthetical and philosophical essays. Vol. I. Edited by Nathan Haskell Dole. Boston: Francis A. Niccolls & Co, 1903.
Aesthetical letters and essays, letter VIII, p.28