ἐπιχρονίζω
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)
A last long, Thphr.Ign.61 ; ὅταν [τὸ θερμὸν] -χρονίσῃ Arist.Pr.936a20 ; ἐπικεχρονικός inveterate, chronic, Gal.11.103:— Pass., ἀὴρ -όμενος ψυχθείς when cooled in course of time, Arist.Pr. 942a33.