John Chrysostom
They all did this from covetousness. Observe: they did not wish to believe, yet they wished to cast out demons by this name.
Yes, so great was the name of Paul. Those exorcists did not consider Jesus great if they added Paul's name to His, regarding Paul as something great.
What blindness there was in those who remained in unbelief even after the manifestation of such power. As Simon sought the grace of the Spirit for profit, so these did the same for the same reason.
What blindness! Why does Paul not forbid them? Because this would have seemed the work of envy. Therefore it is so arranged.
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This also happened in Christ's time, but then no obstacle was placed, because the work was then beginning. Thus Judas, being a thief, meets no obstacle, but Ananias and Sapphira are deprived of life.
Many of the Jews resisted and suffered nothing, while Elymas was blinded. For Christ says, "God did not send His Son into the world to judge the world, but that the world might be saved through Him"; Jn 3:17.
Look at their impiety. Remaining Jews, they wished to make use of the name of Jesus, because they did everything from vainglory and greed.
Why did these wretched men not say, "We believe in Him"? They feared Paul, although they would have had far greater glory if they had said this and acknowledged His dominion.
Besides, they remembered what had happened in Philippi; Acts 16:18. Notice how concise our writer is. He simply writes the history and condemns no one.
This made the Apostles worthy of admiration. Why did they wander through the villages? Was it for profit, and not for preaching?
But let us see what great malice belonged to the work of the exorcists. We shall consider another time, not now, why the same thing did not happen under Christ.
Let us only note that here it was done well and usefully. It seems to me that they were doing this mockingly.
For this reason they are punished, so that afterward no one might dare to pronounce this name carelessly.
So here also the exorcists, though they themselves knew of whom they were speaking, said simply over the demon-possessed: "We adjure you by Jesus whom Paul preaches."
From what they say in confirmation, it is clear that they knew. They say only, "by Jesus," whereas they should have said: by the Savior of the universe, risen from the dead.