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What men want is not knowledge but certainty.

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Love is wise; hatred is foolish. In this world, which is getting more and more closely interconnected, we have to learn to tolerate each other, we hav...more

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When a man tells you he knows the exact truth about anything, you are safe in inferring he is an inexact man.

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I think the essence of wisdom is emancipation, as far as possible, from the tyranny of the here and now.

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The fundamental cause of the trouble is that in the modern world the stupid are cocksure while the intelligent are full of doubt.

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In all affairs it's a healthy thing now and then to hang a question mark on the things you have long taken for granted.

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The whole problem with the world is that fools and fanatics are always so sure of themselves and wiser people so full of doubts.

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Two things are to be remembered: that a man whose opinions and theories are worth studying may be presumed to have had some intelligence, but that no ...more

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William James used to preach the 'will to believe.' For my part, I should wish to preach the 'will to doubt' ... what is wanted is not the will to bel...more

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I went to Russia a Communist; but contact with those who have no doubts has intensified a thousandfold my own doubts, not as to Communism in itself, b...more