"The single thing which makes any man happiest is the realization that he has worked up to the limits of his ability, his capacity. It's all the better, of course, if this work has made a contribution to knowledge, or toward moving the human race a little farther forward."

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Human history began as an act of disobedience, and it is not unlikely that it will be terminated by an act of obedience. At this point in history the capacity to doubt, to criticize and to disobey may be all that stands between a future for mankind and the end of civilization.

— Erich Fromm