Ζῆν οὐκ ἄξιος, ὅτῳ μηδὲ εἷς ἐστι χρηστὸς φίλος → Life is not worth living if you do not have at least one friend.
subs.
P. μαρμαρυγή, ἡ (Plat.), Ar. and V. σέλας, τό (also Plat. but rare P.), αὐγή, ἡ (also Plat. but rare P.): see glitter.
Met., brilliant effort: P. and V. ἀγώνισμα, τό.