παραστάτις
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)
[στᾰ], ῐδος, fem. of παραστάτης, S.Tr.889 ;
A helper, Id.OC559, X.Mem. 2.1.32, etc. II παραστατίς (sic)· ἀγγεῖον θερμαντικόν, Hsch.