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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.
see ἐφει<<><>>σα.
ἐφεσσάμενος: part. aor. med. к ἐφέννυμι и ἐφεῖσα.