Remember that [scientific ...

Remember that [scientific thought] is the guide of action; that the truth which it arrives at is not that which we can ideally contemplate without error, but that which we may act upon without fear; and you cannot fail to see that scientific thought is not an accompaniment or condition of human progress, but human progress itself.
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 William Kingdon Clifford

Quotes from the same author

The danger to society is not merely that it should believe wrong things, though that is great enough; but that it should become credulous, and lose the habit of testing things and inquiring into them; for then it must sink back into savagery.
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 William Kingdon Clifford
When an action is once done, it is right or wrong for ever; no accidental failure of its good or evil fruits can possibly alter that.
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 William Kingdon Clifford
He who truly believes that which prompts him to an action has looked upon the action to lust after it, he has committed it already in his heart.
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 William Kingdon Clifford
A little reflection will show us that every belief, even the simplest and most fundamental, goes beyond experience when regarded as a guide to our actions.
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 William Kingdon Clifford