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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.
spy: P. and V. κατάσκοπος, ὁ; see spy.
traveller: P. and V. ὁδοιπόρος, ὁ.