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ἀπροσοίστως ἔχειν

From LSJ

Τὸ νικᾶν αὐτὸν αὑτὸν πασῶν νικῶν πρώτη τε καὶ ἀρίστη → The first and best victory is to conquer self.

Plato, Laws, 626e

Greek > English (Woodhouse)

be inaccessible, be unapproachable, be unsociable