A.T. Robertson Commentary Acts 19:11

"And God wrought special miracles by the hands of Paul:" — Acts 19:11 (ASV)

Special miracles (δυναμεις ου τας τυχουσας). "Powers not the ones that happen by chance," "not the ordinary ones," litotes for "the extraordinary." All "miracles" or "powers" (δυναμεις) are supernatural and out of the ordinary, but here God regularly wrought (εποιε), imperfect active) wonders beyond those familiar to the disciples and completely different from the deeds of the Jewish exorcists. This phrase is peculiar to Luke in the N.T. , but it occurs in the classical Greek and in the Koine as in III Macc. 3:7 and in papyri and inscriptions (Deissmann, Bible Studies, p. 255). In Samaria Philip wrought miracles to deliver the people from the influence of Simon Magus. Here in Ephesus exorcists and other magicians had built an enormous vogue of a false spiritualism and Paul faces unseen forces of evil. His tremendous success led some people to superstitious practices thinking that there was power in Paul's person.