"The whole problem with the world is that fools and fanatics are always so certain of themselves, and wiser people so full of doubts."
"Man is a rational animal—so at least I have been told. … Aristotle, so far as I know, was the first man to proclaim explicitly that man is a rational animal. His reason for this view was … that some people can do sums. … It is in virtue of the intellect that man is a rational animal. The intellect is shown in various ways, but most emphatically by mastery of arithmetic. The Greek system of numerals was very bad, so that the multiplication table was quite difficult, and complicated calculations could only be made by very clever people."
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Source: Bertrand Russell (2016). “The Problems of Philosophy”, p.75, Bertrand Russell
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