"The whole problem with the world is that fools and fanatics are always so certain of themselves, and wiser people so full of doubts."
"We are ... led to a somewhat vague distinction between what we may call "hard" data and "soft" data. This distinction is a matter of degree, and must not be pressed; but if not taken too seriously it may help to make the situation clear. I mean by "hard" data those which resist the solvent influence of critical reflection, and by "soft" data those which, under the operation of this process, become to our minds more or less doubtful."
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Source: Bertrand Russell (1914). “Our Knowledge of the External World as a Field for Scientific Method in Philosophy”
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