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How are we to adjudicate among rival ontologies? Certainly the answer is not provided by the semantical formula "To be is to be the value of a variable"; this formula serves rather, conversely, in testing the conformity of a given remark or doctrine to a prior ontological standard.

— Willard van Orman Quine

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More quotes by Willard van Orman Quine

The word 'definition' has come to have a dangerously reassuring sound, owing no doubt to its frequent occurrence in logical and mathematical writings.

One man's observation is another man's closed book or flight of fancy.

Our argument is not flatly circular, but something like it. It has the form, figuratively speaking, of a closed curve in space.

Necessity resides in the way we talk about things, not in the things we talk about.

Ways of Paradox and Other Essays (1976)

Logic chases truth up the tree of grammar.

Philosophy of Logic (1970)

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