διαμαχητέον
From LSJ
τοῖς πράγμασιν γὰρ οὐχὶ θυμοῦσθαι χρεών· μέλει γὰρ αὐτοῖς οὐδέν· ἀλλ' οὑντυγχάνων τὰ πράγματ' ὀρθῶς ἂν τιθῇ, πράξει καλῶς → It does no good to rage at circumstance; events will take their course with no regard for us. But he who makes the best of those events he lights upon will not fare ill.
Greek (Liddell-Scott)
διαμᾰχητέον: ῥημ. ἐπίθ. τοῦ διαμάχεσθαι, Πλάτ. Σοφ. 241D (διάφ. γραφ. διαμαχετέον), ὁ αὐτ. Πολ. 380Β.