an ancient Greek skeptic named Pyrrho, brought to light through the writings of one of his followers, a Roman author named Sextus Empiricus. Pyrrho was in many ways an anti-philosopher. Where most philosophers were interested in finding truth, Pyrrho was not. Instead, he seemed determined to show that knowing anything with certainty was impossible — though he knew it would be foolish to actually make that claim. When academic skeptics would assert that it was impossible to know anything, Pyrrho would respond, “How do you know that?” You see, the statement that you cannot know anything is
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