“Knowledge is not so precise a concept as is commonly thought.”

— Bertrand Russell

1940s, Philosophy for Laymen (1946)
Context: Knowledge is not so precise a concept as is commonly thought. Instead of saying “I know this,” we ought to say “I more or less know something more or less like this.” It is true that this proviso is hardly necessary as regards the multiplication table, but knowledge in practical affairs has not the certainty or the precision of arithmetic. Suppose I say “democracy is a good thing”: I must admit, first, that I am less sure of this than I am that two and two are four, and secondly, that “democracy” is a somewhat vague term which I cannot define precisely. We ought to say, therefore: “I am fairly certain that it is a good thing if a government has something of the characteristics that are common to the British and American Constitutions,” or something of this sort. And one of the aims of education ought to be to make such a statement more effective from a platform than the usual type of political slogan.

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Bertrand Russell 562

logician, one of the first analytic philosophers and politi… 1872–1970

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“Knowledge is not so precise a concept as is commonly thought. Instead of saying "I know this," we ought to say "I more or less know something more or less like this."”

Bertrand Russell (1872–1970) logician, one of the first analytic philosophers and political activist

It is true that this proviso is hardly necessary as regards the multiplication table, but knowledge in practical affairs has not the certainty or the precision of arithmetic. Suppose I say "democracy is a good thing": I must admit, first, that I am less sure of this than I am that two and two are four, and secondly, that "democracy" is a somewhat vague term which I cannot define precisely. We ought to say, therefore: "I am fairly certain that it is a good thing if a government has something of the characteristics that are common to the British and American Constitutions," or something of this sort. And one of the aims of education ought to be to make such a statement more effective from a platform than the usual type of political slogan.
1940s, Philosophy for Laymen (1946)