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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.
neuter of δοῦλος; subservient: servant.
δοῦλον: τό1) рабство, неволя Eur.;2) собир. рабы Eur.