“Whereof one cannot speak, thereof one must be silent. Language draws a limit to the world of facts. What lies beyond this limit is mystical. The logical structure of language reflects the logical structure of the world.”

Ludwig Wittgenstein Tractatus Logico-Philosophicus (1921), propositions 7, 5.61, 4.12; translated by C.K. Ogden, Dover

Commentary

Wittgenstein's famous closing statement. Language can represent facts (positive statements); whatever cannot be stated (ethics, aesthetics, the 'mystical') must remain silent. This doesn't dismiss these domains but recognizes their transcendence of language.

This was revolutionary in early twentieth-century philosophy. It grounded logic (and thus mathematics, science, empirical knowledge) while acknowledging domains beyond language: values, meaning, transcendence. Wittgenstein's later work complicated this picture, but the principle—that language has limits—remained central to his philosophy and influenced linguistic philosophy, logical positivism, and postmodern thought.