What does the verification principle say about whether a statement is meaningful?

The verifiability principle is a core doctrine of Logical Positivism that establishes a strict criterion for cognitive meaning. According to this principle, a statement is considered meaningful only if it is either empirically verifiable or tautological (true by definition).1

• Empirical Verifiability: A statement has meaning if it expresses a proposition whose truth or falsehood can be determined, at least in principle, through observation or experience. The meaning of such a statement is defined by the set of conditions under which it would be true.12
• Tautology: A statement is meaningful if its truth arises entirely from the logical meanings of its terms, such as in mathematics or formal logic.1

Under this framework, statements that are neither tautological nor empirically verifiable—including those concerning metaphysics, ethics, aesthetics, or religion—are classified as literally meaningless. While such expressions may influence human emotions or conduct, they do not impart knowledge because they cannot be proven true or false.12

Would you like to explore the criticisms of this principle or how it influenced 20th-century philosophy?