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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.
subs.
Ar. and P. πυκνότης, ἡ.
Dulness: P. νώθεια, ἡ (Plat.), ἀναισθησία, ἡ, P. and V. ἀμαθία, ἡ.