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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.
Euterpe: ēs, f., = Εὐτέρπη,I the muse of music, Hor. C. 1, 1, 33; Aus. Idyll. 20, 4.