Ludwig Wittgenstein

“If a blind man were to ask me “Have you got two hands?” I should not make sure by looking. If I were to have any doubt of it, then I don’t know why I should trust my eyes. For why shouldn’t I test my eyes by looking to find out whether I see my two hands? What is to be tested by what?”

Wittgenstein, Ludwig, On Certainty
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On Certainty On Certainty by Ludwig Wittgenstein
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