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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.
1ᵉ pl. de οἶδα, v. *εἴδω.
ἴσμεν: 1 л. pl. praes. к *εἴδω.