"The first and best victory is to conquer self; to be conquered by self is of all things most shameful and vile"
The saying in ancient Greek, with accents and all, as shown above in lpap's message, is:
τὸ νικᾶν αὐτὸν αὑτὸν πασῶν νικῶν πρώτη τε καὶ ἀρίστη, τὸ δὲ ἡττᾶσθαι αὐτὸν ὑφ’ ἑαυτοῦ πάντων αἴσχιστόν τε ἅμα καὶ κάκιστον