To squelch any though that Jesus might be the Messiah, a group of Pharisees accused Jesus of casting out demons by the power of Beelzebub, the ruler of the demons. If Satan casts out Satan, he is divided against himself. Therefore they shall be your judges. But if I cast out demons by the Spirit of God, surely the kingdom of God has come upon you. And then he will plunder his house.
Division brings about destruction.
God is greater than any satanic power. We see that principle at work all around us. The division initially may not be over anything that is all that earthshaking. The same thing happens in the home. The most potent means of destroying any organization, institution, or entity is internal strife or internal conflict.