Matthew 12:25-26

Brethren, I am here to tell you that the demons are a kingdom divided against themselves. What Jesus was addressing was a challenge that the demon that he had just cast out of this person had been cast out by Satan. Jesus' argument was, "No, Satan would never cast out Satan." That would be stupid for Satan to cast out Satan. But He is not saying that under every condition that Satan or other demons will not cast out other demons. And indeed that does take place.

They are very capable of doing signs and lying wonders. They can make it look as though somebody has been healed, when God has not done the healing at all, but simply by the removal of one demon by a demon of greater power.

I go through this because I want you to understand that one of the things that saves us (if I can put it that way) is that the demons are divided against themselves. Because they are a kingdom divided against themselves they cannot stand. If I can put it in another way, they cannot get their act together because their character is such that they are always in competition with each other.