Wittgenstein argued a language only you could understand is impossible

Could you invent a private language to name your own sensations, one no one else could ever check? Wittgenstein argued no: without any public way to verify you're using a word consistently, there's no real difference between using it correctly and merely seeming to — so the whole idea of a wholly private meaning collapses.

— Ludwig Wittgenstein, Philosophical Investigations — 1953
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