Quine's own criterion of ontological commitment, applied consistently, forces quantification over properties when predicates appear in true sentences, undermining any nominalist block.

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Nominalist block(as what Quine's criterion prevents): A nominalist's attempt to avoid admitting that abstract properties exist by limiting what must exist according to a philosophical principle.
Predicates(in logic and philosophy of language): Words or phrases that describe properties or characteristics of something—like 'is red' or 'is tall' in the sentence 'The ball is red.'
Quantification(logic): The part of a statement that specifies how many things you're talking about—words like 'all,' 'some,' or 'none'.
Quine(as a proper name referring to the philosopher whose theory is being discussed): Willard Van Orman Quine was a 20th-century American philosopher who wrote about how we know things and how language works. In this statement, we're discussing one of his specific ideas about observation.

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