ἥγε
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
French (Bailly abrégé)
English (Autenrieth)
(ὅ γε, etc.): the demonstr. ὅ, ἥ, τό intensified, and yet often employed where we should not only expect no emphasis, but not even any pronoun at all, as in the second of two alternatives, Il. 3.409, Il. 12.240, Od. 2.327 . ὅ γε serves, however, to keep before the mind a person once mentioned (and perhaps returned to after an interruption), thus usually the very opp. of ὃ δέ, which introduces a new person in antithesis.