Acts 19:11 - John Gill's Exposition of the Entire Bible

And God wrought special miracles by the hands of Paul. For the confirmation of the doctrine which he preached, and of his mission, as an apostle; and these were not any sort of miracles, common and vulgar ones, and much less things of chance, and what were merely accidental, as the word may signify; but they were rare and uncommon ones, and in which there was a visible display of the power of God; to whom as the efficient cause they are ascribed, the apostle being only an instrument God made use of.