"Some have raised the question of whether we can receive valid information from demons themselves. Demons are portrayed in the Bible as beings who have personalities and intelligence, and as beings who can and do speak. They are also portrayed as deceivers. It must therefore be concluded that they do possess some valid information. The question then becomes: Does any of this valid information get communicated to us when they speak? Obviously so, but discernment is needed to process whatever we hear from them in order to separate truth from falsehood. I once heard Ed Murphy point out this very interesting fact: Every time the words of a demon are recorded in the New Testament, they speak the truth! Is this not biblical evidence that we can indeed get valid information from the world of darkness?"
(C. Peter Wagner, Confronting the Powers, Regal Books, 1996, p. 70)
[TBC: "And have no fellowship with the unfruitful works of darkness, but rather reprove them" (Ephesians:5:11). Consider also the reaction of Paul when confronted by a "truth telling" demoniac: "And it came to pass, as we went to prayer, a certain damsel possessed with a spirit of divination met us, which brought her masters much gain by soothsaying: The same followed Paul and us, and cried, saying, These men are the servants of the most high God, which shew unto us the way of salvation. And this did she many days. But Paul, being grieved, turned and said to the spirit, I command thee in the name of Jesus Christ to come out of her. And he came out the same hour" (Acts:16:16-18).]