Ayer's Verification Principle
I could not tell how
humans can know right from wrong,
not even this bridge
can predict energetic
flashes of watery light.
An attempt to define meaning: a sentence S is meaningful if and only if its truth value can be verified (by observation). It ruled out a lot of sentences that seem meaningful, as meaningless, including moral statements. The verificationists later admitted the kinds of meaning this can accommodate is really quite narrow.
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