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Ἓν οἶδα, ὅτι οὐδὲν οἶδα → I know only one thing, that I know nothing | all I know is that I know nothing.
Ar. and P. διάβολος, βάσκανος, P. συκοφαντικός, V. λοίδορος (Eur., Cyclops), κακόστομος; see abusive.
