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After defining semantical concepts like logical truth and related ones, I proposed to interpret the modalities as those properties of propositions which correspond to certain semantical properties of the sentences expressing the propositions. For example, a proposition is logically necessary if and only if a sentence expressing it is logically true.

— Rudolf Carnap Intellectual Biography (1963)

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More quotes by Rudolf Carnap

Logic is the last scientific ingredient of Philosophy; its extraction leaves behind only a confusion of non-scientific, pseudo problems.

The Unity of Science (1934)

In science there are no 'depths'; there is surface everywhere.

Rudolf Carnap (1929)

A decisive difference between our method and Frege's consists in the fact that our concepts, in distinction to Frege's, are independent of the context.

Meaning and Necessity (1947)

Frege's pair of concepts (nominatum and sense) is compared with our pair (extension and intension). The two pairs coincide in ordinary (extensional) contexts, but not in oblique (nonextensional) contexts.

Meaning and Necessity (1947)

Science is a system of statements based on direct experience, and controlled by experimental verification. Verification in science is not, however, of single statements but of the entire system or a sub-system of such statements.

The Unity of Science (1934)

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Quote text and notes from Wikiquote: Rudolf Carnap (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.