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.
Nor would you think in the compacting together of our limbs any division of power to be made, for there can be no division in an undivided thing. And therefore the appellation of finger must be referred to the form of unity, not to the distinction of power.