"Farewell the tranquil mind": tragic doubt in Homer's Iliad, Sophocles' Philoctetes, and Shakespeare's Othello -- Comic skepticism and polytropic strategies in Homer's Odyssey, Aristophanes' Women of the Thesmophoria, and Shakespeare's As you like it -- Skepticism, politics, and rhetoric in the works of Cicero, Machiavelli, and Montaigne