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φαῖμεν

Ὁ δ' ἀνεξέταστος βίος οὐ βιωτὸς ἀνθρώπῳ -> The unexamined life is not worth living
Plato, Apology of Socrates 38a

Russian (Dvoretsky)

φαῖμεν: (= φαίημεν) 1 л. pl. opt. к φημί.