Quine argued in 'Philosophy of Logic' that quantifying into sentential position requires propositional entities as values, but no such entities can be individuated without paradox.

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Philosophy of Logic(as the title of Quine's work): The branch of philosophy that examines what logic is, how it works, and what its rules tell us about the nature of reality and reasoning.
Propositional entities(what Quine argues would be needed as values for quantifying): Abstract things that represent the meaning of statements or claims—basically, the 'what is being said' as if it were a thing that exists.
Quantifying(the logical operation Quine is discussing): In logic, using words like 'all,' 'some,' or 'none' to talk about how many things have a certain property.
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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