Quotation by Noam Chomsky

We thus make a fundamental distinction between the competence (the speaker-hearer's knowledge of his language) and performance (the actual use of language in concrete situations).
Noam Chomsky (b. 1928), U.S. mathematical linguist, philosopher, psychologist, political critic. Aspects of the Theory of Syntax, p. 3 (1965).

Drawing the author's key distinction for dismissing raw empirical data as providing direct counter-evidence to his linguistic theories of grammar.
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