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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.
quarrel: P. and V. ἔρις, ἡ, στάσις, ἡ.
factious body: use P. and V. στάσις, ἡ.