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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.
3ᵉ sg. ao. itér. de αὐδάω.
αὐδήσασκε: эп. 3 л. sing. aor. iter. к αὐδάω.