Jamieson, Fausset and Brown on Luke 10:17

17. returned--evidently not long away.

Lord, &c.--"Thou hast exceeded Thy promise, for 'even the devils,'" &c. The possession of such power, not being expressly in their commission, as in that to the Twelve (Lu 9:1), filled them with more astonishment and joy than all else.

through thy name--taking no credit to themselves, but feeling lifted into a region of unimagined superiority to the powers of evil simply through their connection with Christ.