“And he called them unto him, and said unto them in parables, How can Satan cast out Satan?”
Mark 3:23 — Greek Interlinear
Church Fathers on Mark 3:23
The meaning of the example is this: The devil is the strong man; his goods are the men into whom he is received; unless therefore a man first conquers the devil, how can he deprive him of his goods, that is, of the men whom he has possessed?
The Lord has also bound the strong man, that is, the devil: which means, He has restrained him from seducing the elect, and entering into his house, the world; He has spoiled his house, and his goods, that is men, because He has snatched them from the snares of the devil, and has united them to His Church.
Or this is meant; that he will not deserve to work out repentance, so as to be accepted, who, understanding who Christ was, declared that He was the prince of the devils.