Ask at the forum if you have an Ancient or Modern Greek query!
Ζῆν οὐκ ἄξιος, ὅτῳ μηδὲ εἷς ἐστι χρηστὸς φίλος → Life is not worth living if you do not have at least one friend.
spy: P. and V. κατάσκοπος, ὁ; see spy.
traveller: P. and V. ὁδοιπόρος, ὁ.