"The whole problem with the world is that fools and fanatics are always so certain of themselves, and wiser people so full of doubts."
"In obedience to the feeling of reality, we shall insist that, in the analysis of propositions, nothing "unreal" is to be admitted. But, after all, if there is nothing unreal, how, it may be asked, could we admit anything unreal? The reply is that, in dealing with propositions, we are dealing in the first instance with symbols, and if we attribute significance to groups of symbols which have no significance, we shall fall into the error of admitting unrealities, in the only sense in which this is possible, namely, as objects described."
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Source: Bertrand Russell (2007). “Introduction to Mathematical Philosophy”, p.170, Spokesman Books
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