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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.
steer: P. and V. κυβερνᾶν, Ar. and V. ναυστολεῖν.
sail over: P. and V. πλεῖν (acc.).
Absol., take to the sea: P. πλωΐζειν.