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Wittgenstein claims that it is a 'superstition' to think that, "language (or thinking) is something unique". Is the point here just that 'language' does not have an essential feature and similarly for thinking. And why is it a superstition rather than a mistake? - Is that to do with the fact that conceptual confusion is involved - and so thinking that language or thinking is something unique is to be caught up in an illusion rather than to be mistaken about something? Couldn't you say that someone has made a mistake about the correct use of an expression?