The apparent cognitive difference between the two sentences is explained pragmatically or psychologically, not by positing distinct fundamental propositional constituents, preserving compositionality without multiplying semantic entities.

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Pragmatically(describing Euclid's practical approach to using the parallel postulate): Dealing with something based on what actually works in practice, rather than on theory or principle alone.
cognitive difference(as used in philosophy of mind): A difference in how our minds understand or experience something, like the difference between thinking about 'now' versus thinking about a specific time.
compositionality(Philosophy of language; the passage treats idioms as candidate counterexamples because their meanings appear not to be so constructed): The property of natural language whereby the meaning of a complex expression is built from the meanings of its constituting parts
multiplying semantic entities(a concern in philosophy about not overcomplicating explanations): Creating or assuming more separate 'meaning-things' than necessary; essentially, making things more complicated than they need to be by inventing extra concepts.

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