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Ζῆν οὐκ ἄξιος, ὅτῳ μηδὲ εἷς ἐστι χρηστὸς φίλος → Life is not worth living if you do not have at least one friend.
φράξαι: imper. aor. 1 med. к φράσσω (v. l. - per metathesin - φάρξαι, Aesch., Septem 63).