The Scofield Bible Commentary, by Cyrus Ingerson Scofield, [1917], at sacred-texts.com
Have
Not as in A.V, "since ye believed," but as in R.V. And margin reference, "Did ye receive the Holy Spirit when ye believed?" Paul was evidently impressed by the absence of spirituality and power in these so-called disciples. Their answer brought out the fact that they were Jewish proselytes, disciples of John the Baptist, looking backward to an accomplished redemption. (Rom 8:9); (Co1 6:19); (Eph 1:13).
overcame
The sons of Sceva sought to imitate a power to which they were strangers, only to their own confusion. This striking witness from another side caused fear to fall on all.
prevailed
(Luk 11:21); (Luk 11:22); (Jo1 4:4).
spirit
That is, in his own mind.
(See Scofield) - (Act 20:22).
about the way
Concerning the Way, that is, Christ. (Joh 14:6).
world
(Greek, "oikoumenē", means "inhabited earth").
(See Scofield) - (Luk 2:1).
Diana
Greek "Artemis". Not anciently of the Greek pantheon, but an Eastern goddess.
Compare (See Scofield) - (Jdg 2:13).
But "Diana of the Ephesians" was rather a particular image of Artemis, reputed to have fallen from heaven; (Act 19:35).