Acts 16:18

But Paul, being grieved - Being molested, troubled, offended. Paul was grieved, probably:

1. Because her presence was troublesome to him;
2. Because it might be said that he was in alliance with her, and that his pretensions were just like hers;
3. Because what she did was for the sake of gain, and was a base imposition;
4. Because her state was one of bondage and delusion, and it was proper to free her from this demoniacal possession; and,
5. Because the system under which she was acting was a part of a scheme of delusion and imposture, which had spread over a large portion of the pagan world, and which was then holding it in bondage.

Throughout the Roman empire the inspiration of the priestesses of Apollo was believed in, and temples were everywhere reared to perpetuate and celebrate the delusion. Against this extensive system of imposture and fraud Christianity must oppose itself; and this was a favorable instance to expose the delusion, and to show the power of the Christian religion over all the arts and powers of imposture. The mere fact that in a very few instances - of which this was one - they spoke the truth, did not make it improper for Paul to interpose. That fact would only tend to perpetuate the delusion, and to make his interposition more proper and necessary. The expulsion of the evil spirit would also afford a signal proof of the fact that the apostles were really from God a far better proof than her noisy and troublesome proclamation of it would furnish.

In the name of Jesus Christ - Or, by the authority of Jesus Christ. See the notes on Acts 3:6.