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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.
from ἐκ and πορεύομαι; to depart, be discharged, proceed, project: come (forth, out of), depart, go (forth, out), issue, proceed (out of).