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It is possible to believe in progress as a fact without believing in progress as an ethical principle; but in the catechism of many Americans, the one goes with the other.
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Progress imposes not only new possibilities for the future but new restrictions.
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The simple faith in progress is not a conviction belonging to strength, but one belonging to acquiescence and hence to weakness.
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The more we get out of the world the less we leave, and in the long run we shall have to pay our debts at a time that may be very inconvenient for our own survival.
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Any use of a human being in which less is demanded of him and less is attributed to him than his full status is a degradation and a waste.
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What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead.
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In all important respects, the man who has nothing but his physical power to sell has nothing to sell which it is worth anyone's money to buy
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To live effectively is to live with adequate information.