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Continue to ChatWe 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. - A.J. Ayer from https://whatsmyquote.com/quote/we-say-that-a-sentence-is-factually-significant-to-any-given-person-if-and-only-if-he-knows-how-to-verify-the