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Why did logical positivists regard many metaphysical statements as meaningless?

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Marble bust of Aristotle with a beard and draped robe, showing detailed facial features and wavy hair, set against a dark background. — metaphysics Detail of a Roman copy (2nd century bce) of a Greek alabaster portrait bust of Aristotle (c. 325 bce); in the collection of the Museo Nazionale Romano, Rome.

Logical positivists regarded many metaphysical statements as meaningless because they failed to meet the criteria of the verifiability principle. This doctrine posits that for a non-tautological statement to be cognitively meaningful, it must be empirically verifiable—meaning there must be observable conditions relevant to determining its truth or falsity.21

The Vienna Circle and other proponents of logical positivism argued that meaningful statements fall into only two categories:
* Analytic propositions: Statements that are true or false by definition, such as those in logic or mathematics.21
* Synthetic propositions: Statements that express matters of empirical fact, which can be tested through observation or scientific inquiry.21

Metaphysical claims, such as those regarding a "transcendent reality" or the nature of "The Absolute," were viewed as neither analytic nor empirically verifiable. Because no possible observation could count for or against these assertions, positivists concluded they lacked factual significance. While such statements might evoke emotions or influence conduct, they were considered literally meaningless in terms of imparting objective knowledge.231