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The criterion which we use to test the genuineness of apparent statements of fact is the criterion of verifiability. We say that a sentence is factua… - A. J. Ayer
" "The criterion which we use to test the genuineness of apparent statements of fact is the criterion of verifiability. We say that a sentence is factually significant to any given person, if, and only if, he knows how to verify the proposition which it purports to express — that is, if he knows what observations would lead him, under certain conditions, to accept the proposition as being true, or reject it as being false.
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About A. J. Ayer
Sir Alfred Jules Ayer (29 October 1910 – 27 June 1989), more often referred to as A. J. Ayer or Freddie Ayer, was a British humanist philosopher, who was one of the leading proponents of logical positivism.
Biography information from Wikiquote
Also Known As
Alternative Names:
Alfred Jules Ayer
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Alfred J. Ayer
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Sir Alfred Jules Ayer
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Freddie
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Additional quotes by A. J. Ayer
The principles of logic and mathematics are true simply because we never allow them to be anything else. And the reason for this is that we cannot abandon them without contradicting ourselves, without sinning against the rules which govern the use of language, and so making our utterances self-stultifying. In other words, the truths of logic and mathematics are analytic propositions or tautologies.
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If now I…say "Stealing money is wrong," I produce a sentence which has no factual meaning — that is, expresses no proposition which can be either true or false. It is as if I had written "Stealing money!!" — where the shape and thickness of the exclamation marks show, by a suitable convention, that a special sort of moral disapproval is the feeling which is being expressed.
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