Sentence:  The private language machine and the evolution of a medium: One of the things that Wittgenstein is most famous for is <WSD>quining</WSD> "private language". By saying that private languages can't exist Wittgenstein wanted us to recognize the inescapable function of the social fabric in language's work. 
Meaning of the word marked with <WSD> tags:  To deny the existence or significance of something obviously real or important.