What does...’preaching by the power of an unclean spirit’, mean?
Acts Chapter 16 16 Now it happened, as we went to prayer, that a certain slave girl possessed with a spirit of divination met us, who brought her masters much profit by fortune-telling. 17 This girl followed Paul and us, and cried out, saying, "These men are the servants of the Most High God, who proclaim to us the way of salvation." 18 And this she did for many days. But Paul, greatly annoyed, turned and said to the spirit, "I command you in the name of Jesus Christ to come out of her." And he came out that very hour. 19 But when her masters saw that their hope of profit was gone, they seized Paul and Silas and dragged them into the marketplace to the authorities.
Matthew Chapter 12 43 "When an unclean spirit goes out of a man, he goes through dry places, seeking rest, and finds none. 44 Then he says, 'I will return to my house from which I came.' And when he comes, he finds it empty, swept, and put in order. 45 Then he goes and takes with him seven other spirits more wicked than himself, and they enter and dwell there; and the last state of that man is worse than the first. So shall it also be with this wicked generation."
In Biblical terms I meant she was possessed by a demonic spirit.....Christ cast out many unclean demonic spirits....And in the book of Acts the apostles did the same.......The Devil knows scripture, but he twists it into a mockery of God.....He tempted Christ in the wilderness and quoted scripture......Through the power of The Holy Ghost we have the power to do the same if we are believers....But we had better be fasting and prayed up before we attempt that....They will fight back, and that is in the book of Acts also.....Demon spirits know who we are in Christ.....