Whereof one cannot speak, thereof one must be silent.
Wovon man nicht sprechen kann, darueber muss man schweigen.

Philosophers
Ludwig Wittgenstein
Austrian philosopher born in 1889 who gave away his fortune and twice redrew the map of philosophy. His Tractatus set language limits; his Philosophical Investigations dismantled his own framework.
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Source: Tractatus Logico-Philosophicus, 命題7Verified