John Chrysostom
Catena Aurea · Lukasevangelium 11
But he, knowing their thoughts, said unto them, Every kingdom divided against itself is brought to desolation; and a house divided against a house falleth. If Satan also be divided against himself, how shall his kingdom stand? because ye say that I cast out devils through Beelzebub. And if I by Beelzebub cast out devils, by whom do your sons cast them out? therefore shall they be your judges. But if I with the finger of God cast out devils, no doubt the kingdom of God is come upon you.
(ubi sup.) He did not answer them from the Scriptures, since they gave no heed to them, explaining them away falsely; but he answers them from things of every day occurrence. For a house and a city if it be divided is quickly scattered to nothing; and likewise a kingdom, than which nothing is stronger. For the harmony of the inhabitants maintains houses and kingdoms. If then, says He, I cast out devils by means of a devil, there is dissension among them, and their power perishes. Hence He adds, But if Satan be divided against himself, how shall he stand? For Satan resists not himself, nor hurts his soldiers, but rather strengthens his kingdom. It is then by Divine power alone that I crush Satan under my feet.