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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.
P. and V. ἔχθρα, ἡ, ἔχθος, τό; see dislike, hostility.
opposition: P. ἐναντίωσις, ἡ.
discord: P. and V. ἔρις, ἡ.