φρονητέον
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.
English (LSJ)
A one must think, ἐπί τινι μέγα φ. one must pride oneself on . . X.HG2.4.40; μεῖζον φ. Id.Ages.8.4; μεῖον Id.Ap.26.
Greek (Liddell-Scott)
φρονητέον: ῥηματ. ἐπίθ. τοῦ φρονῶ, δεῖ φρονεῖν, μέγα φρ. ἐπί τινι, πρέπει τις νὰ μεγαλοφρονῇ ἐπί τινι, Ξεν. Ἑλλ. 2. 4, 40· οὕτω, μεῖζον φρον. ὁ αὐτ. ἐν Ἀγησ. 8, 4· μεῖον ὁ αὐτὸς ἐν Ἀπολ. 26.