And the scribes who came down from Jerusalem were saying, “He is possessed by Beelzebul,” and “by the prince of demons He casts out the demons.” And He called them to Him and said to them in parables, “How can Satan cast out Satan? If a kingdom is divided against itself, the kingdom cannot stand. And if a house is divided against itself, that house will not be able to stand. And if Satan has risen up against himself and is divided, he cannot stand, but is coming to an end. But no one can enter a strong man’s house and plunder his goods, unless he first binds the strong man. Then indeed he may plunder his house.”
Mark 3:22-27
We know Jesus has not come in the name of the devil because the devil would never undo his insidious work. Jesus came healing and casting out demons. It makes no sense that the devil would send someone to do this—to undo all his hard work. Christ has entered the devil’s kingdom to destroy it; He has entered the devil’s house to plunder his goods. And what are his goods? You and me. For before Christ came, he had you and me in good order in his house. But then Christ came—God became human. And He walked into the devil’s house, grimaced at the dusty clutter of his belongings, bound the devil in a corner, and started plundering his goods—you and me.
The devil is still bound. Sure, he prowls around like a roaring lion (1 Peter 5:8), but it is as if he’s in a strait jacket. His arms are bound, and he can no longer claw at you, but he can still bite at you in his frothing madness, for he is bound, and he knows he is on borrowed time before Christ our King casts him into the lake of fire. His madness grows bolder as time goes on, for our Lord continues to plunder his goods until He is satisfied with the spoils of His death and resurrection. Once He is satisfied, He will cut the head off the snake and raise all whom He has plundered from the dead to bring them into His eternal kingdom of New Jerusalem.
The Lutheran Column 