A.T. Robertson Commentary Luke 10:17

"And the seventy returned with joy, saying, Lord, even the demons are subject unto us in thy name." — Luke 10:17 (ASV)

Returned with joy (υπεστρεψαν μετα χαρας). They had profited by the directions of Jesus. Joy overflows their faces and their words.

Even the demons (κα τα δαιμονια). This was a real test. The Twelve had been expressly endowed with this power when they were sent out (Luke 9:1), but the Seventy were only told to heal the sick (10:9). It was better than they expected. The Gospel worked wonders and they were happy. The demons were merely one sign of the conflict between Christ and Satan. Every preacher has to grapple with demons in his work.

Are subject (υποτασσετα). Present passive indicative (repetition).