Ambrose of Milan
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.
Herein also He shews His own kingdom to be undivided and everlasting. Those then who possess no hope in Christ, but think that He casts out devils through the chief of the devils, their kingdom, He says, is not everlasting. This also has reference to the Jewish people. For how can the kingdom of the Jews be everlasting, when by the people of the law Jesus is denied, who is promised by the law? Thus in part does the faith of the Jewish people impugn itself; the glory of the wicked is divided, by division is destroyed. And therefore the kingdom of the Church shall remain for ever, because its faith is undivided in one body.