Gonzalez Lodge, Commentary on Plato: Gorgias

νικῶντες τὰς γνώμας: the verb νικᾶν is construed with various accusatives which belong to the ‘cognate’ class, as Ὀλυμπιάδα, παγκράτιον, ψήφισμα, etc. G. 159 R.; H. 716 a.

πάλαι ἐρωτῶ: for the pres. with πάλαι, see H. 826; G. 200, n. 4, and cf. the similar Lat. use of jam diu with the present (Gildersleeve, Gr. § 221).

δαιμονία: has become by this time so weakened as to mean simply wonderful, extraordinary. Cf. the similar weakening of strong words in English; i.e. ‘awful.’

τὶς: by adding to the vagueness, enhances the vastness of the power, like the Lat. quidam. Cf. Cic. ad Fam. x. 12. 1 “idque contigit meritorum tuorum in rem publicam eximia quadam magnitudine”, owing to the rather exceptional greatness, etc.

εἰ πάντα γε εἰδείης: Socrates' object is finally attained, and Gorgias, lulled completely by this ironical expression of admiration, bursts forth into an eloquent laudation of his art, and a defence of it against all censure. The omission of the apodosis gives to the sentence the effect of an exclamation. Such a usage is also common in English.

ἁπάσας τὰς δυνάμεις: may be a compression of ἁπασῶν τῶν τεχνῶν τὰς δυνάμεις. Of course συλλαβοῦσα is only a figure of speech, though Gorgias claims his rhetoric to be the art of all arts. In his exposition he contents himself with a pair of examples only. That this view is really due to Gorgias is shown by the passage in Philebus, quoted on 452 e.