Acts 16:18

But Paul, being grieved,— He might imagine that if the Gentiles believed the testimony of the woman, it might invalidate his doctrine and miracles; and by leading them to suppose that there was a confederacy between them and the evil spirit, it might make the one to be esteemed the effect of magic, and the other no better than the doctrine of devils. He could not but be persuaded, that if the Jews heard of this testimony, it might have a bad influence upon their minds, and make them entertain a suspicion of St. Paul and his associates, for having the approbation and praise of the prince of darkness. The dispossession of the damsel wholly obviated all those inconveniences.