ἀρεστέον
From LSJ
Τὸ νικᾶν αὐτὸν αὑτὸν πασῶν νικῶν πρώτη τε καὶ ἀρίστη. Τὸ δὲ ἡττᾶσθαι αὐτὸν ὑφ' ἑαυτοῦ πάντων αἴσχιστόν τε ἅμα καὶ κάκιστον. → Τo conquer yourself is the first and best victory of all, while to be conquered by yourself is of all the most shameful as well as evil
English (LSJ)
[ᾰ], one must be pleased, c. inf., Tz.H.8.212.
Greek (Liddell-Scott)
ἀρεστέον: ῥηματ. ἐπίθ., δεῖ ἀρέσκειν, μετ’ ἀπαρεμφ., Τζέτζ. Ἱστ. 8. 212.