1889–1951 · Austrian-British philosopher of logic & language
Ludwig Wittgenstein (1889–1951) was an Austrian-born philosopher who did much of his work at Cambridge and is regarded as one of the most important thinkers of the 20th century. His early masterwork, the Tractatus Logico-Philosophicus (German 1921, English 1922), argued that the structure of language mirrors the structure of the world — and that what cannot be said clearly must be passed over in silence. Proposition 5.6 is among its most quoted lines.