If Satan also is divided against himself, how will his kingdom stand? For you say I drive out demons by Beelzebul.
Luke 11:18
Jesus is not here telling us that excorcism is always proof that someone is on the right side of things. There have surely been some fakes and phonies down through history.
But, Jesus had cast out so many demons with such authority that their had to be some explanation. Either he was in league with the devil, or He was God Himself. Using simple logic Jesus here refutes the idea that the devil would allow this.
Satan is the author of confusion. Jesus had a clear message, and His authority was clear. He cast out demons as a spoiler of the powers of darkness. He alone has the authority and ability to do so.
Heavenly Father, thank You for Christ! I will praise You forever. You are wise and strong and good. You have by Your authority made all things in Your will. I will live to love Your ways. In the Name of the Lord Jesus Christ I pray and praise You, Amen.