EIGHTY-THREE DIFFERENT QUESTIONS, QUESTION 79.2
Now as for the Lord’s saying: “Satan cannot drive out Satan,” lest perhaps anyone using the name of some of the lowest powers when driving out a demon should think this opinion of the Lord’s to be false, let him understand the point of this saying: Satan does spare the body or the senses of the body, but he tempts the senses for the purpose of dominating the will of the man in question, in a triumph of greater import, through the error of impiety. Satan does not strike for the body as such, but rather for the innermost self in order to work in him in the manner described by the apostle: “according to the prince of the power of this air, who is now active in the sons of disobedience.” For Satan was not troubling and tormenting the senses of their bodies, nor was he battering their bodies, but he was reigning in their wills, or better, in their covetousness.
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Catena Aurea by Aquinas
(Vict. Ant. e Cat. in Marc.) The blasphemy of the Scribes having been detailed, our Lord shows that what they said was impossible, confirming His proof by an example. Wherefore it says, And having called them together unto him, he said unto them in parables. How can Satan cast out Satan? As if He had said, A kingdom divided against itself by civil war must be desolated, which is exemplified both in a house and in a city. Wherefore also if Satan's kingdom be divided against itself, so that Satan expels Satan from men, the desolation of the kingdom of the devils is at hand. But their kingdom consists in keeping men under their dominion. If therefore they are driven away from men, it amounts to nothing less than the dissolution of their kingdom. But if they still hold their power over men, it is manifest that the kingdom of evil is still standing, and Satan is not divided against himself.
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On the Gospel of Mark
And calling them together, he said to them in parables: How can Satan cast out Satan? And if a kingdom is divided against itself, that kingdom cannot stand. And if a house is divided against itself, that house cannot stand. A kingdom and city divided against itself cannot persist. But just as small things grow through harmony, so the greatest things fall apart through discord (Sallust). Therefore, if Satan fights against himself, and a demon is an enemy of another demon, the end of the world should already have come so that adversarial powers would not have a place in it, since war among them means peace for humans. But if you think, O Scribes and Pharisees, that the departure of demons is due to obedience to their prince, to deceive ignorant men with fraudulent simulation, what can you say about the health of bodies, which the Lord has brought about. It is one thing if you assign to demons also the weaknesses of members and the signs of spiritual powers. And if Satan has risen up against himself, he is divided, and he cannot stand, but has an end. By saying this, he wanted to be understood from their own confession that by not believing in him they had chosen to be in the kingdom of the devil, which surely could not stand divided against itself. Therefore, let the Pharisees choose what they will. If Satan cannot cast out Satan, they could find nothing to say against the Lord. But if he can, they should more carefully consider themselves, and depart from his kingdom, which cannot stand divided against itself.
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