"The whole problem with the world is that fools and fanatics are always so certain of themselves, and wiser people so full of doubts."
"If an opinion contrary to your own makes you angry, that is a sign that you are subsciously aware of having no good reason for thinking as you do. [...] The most savage controversies are those about matters as to which there is no good evidence either way. Persecution is used in theology, not in arithmetic, because in arithmetic there is knowledge, but in theology there is only opinion. So whenever you find yourself getting angry about a difference of opinion, be on your guard; you will probably find, on examination, that your belief is going beyond what the evidence warrants."
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Source: Unpopular Essays. Book by Bertrand Russell, p. 116, 1950.
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