12:27 By whom do your children cast [them] out? There were Jewish exorcists who professed to cast out demons. Josephus tells of one named Eleazar, whom he says did cast them out. Christ does not say whether they did or not, but argues: If I, by Satan, cast out demons, by whom do your own exorcists, whom you assert have this power, cast them out ? Compare Ac 19:13.
12:27 By whom do your children - That is, disciples, cast them out - It seems, some of them really did this; although the sons of Sceva could not. Therefore shall they be your judge - Ask them, if Satan will cast out Satan: let even them be judges in this matter. And they shall convict you of obstinacy and partiality, who impute that in me to Beelzebub, which in them you impute to God. Beside, how can I rob him of his subjects, till I have conquered him? The kingdom of God is come upon you - Unawares; before you expected: so the word implies.
12:22-30 A soul under Satan's power, and led captive by him, is blind in the things of God, and dumb at the throne of grace; sees nothing, and says nothing to the purpose. Satan blinds the eyes by unbelief, and seals up the lips from prayer. The more people magnified Christ, the more desirous the Pharisees were to vilify him. It was evident that if Satan aided Jesus in casting out devils, the kingdom of hell was divided against itself; how then could it stand! And if they said that Jesus cast out devils by the prince of the devils, they could not prove that their children cast them out by any other power. There are two great interests in the world; and when unclean spirits are cast out by the Holy Spirit, in the conversion of sinners to a life of faith and obedience, the kingdom of God is come unto us. All who do not aid or rejoice in such a change are against Christ.
