Matthew Henry
Christ is so wise, that, being engaged in war with him, he will attack his forces wherever he meets them, whether in the bodies or souls of people, v 27. It is plain, Christ's design is to enter into the strong man's house, to take possession of the interest he has in the world, and to spoil his goods, and convert them to his own service; and therefore it is natural to suppose that he will thus bind the strong man, will forbid him to speak when he would, and to stay where he would, and thus show that he has gained a victory over him.
John Gill
This is properly a parable; the other seem to be proverbs, or sayings, that were commonly used to show the ill consequences of discords, factions, and divisions, as is explained in the note on Mt 12:29 -
Or else, how can anyone enter, etc This is another argument of Christ's proving that his casting out of devils could not be by Satan, but by the Spirit of God; for if he did not act by any superior power to Satan's, and such by which he was able to master, overcome, and bind him, he could never spoil his goods, as he did; or dispossess devils out of the bodies or souls of men: just as if a man should enter into another man's house, who is strong and robust, with a design to spoil his goods, who would never make use of the man himself to do it, and can never be thought to effect it, unless he has a power superior to his, and uses it;
except he first bind the strong man, etc by the "strong man", is meant the devil, see Isa 49:24 who is powerful and mighty, as appears from his nature, being an angel, though a fallen one, excelling in strength human creatures; from his names, such as the roaring lion, the great red dragon, leviathan, &c. from the extent of his dominion, here called "his house"; which reaches to the whole posse of devils, and world of men; whence he is called the prince of the power of the air, and the prince of this world, and the god of it; and from his works and actions, in and over the bodies and estates of men, by divine permission; which might be exemplified in the case of Job, and the demoniacs in the time of Christ; and in and over the souls of men, not only over wicked men, but men under a show of religion, as antichrist and his followers; yea, saints themselves, and even over Adam in a state of innocence; but Christ is stronger than he, and attacked him, and dispossessed him of the bodies of men; and restraining him from doing them any hurt, enters into the souls of men, dethrone him, and leads him captive, who led others; and keeps him from doing them any damage; as he will in the latter day "bind" him and shut him up in prison a thousand years; and also "spoils his goods", or "vessels", and "his house"; the palace of Satan, by taking bodies and souls out of his possession; by awakening the conscience, enlightening the mind, working upon the affections, subduing the will, and implanting principles of grace and holiness in the heart; and so making it a fit habitation for God, which spoils it for the devil: in all which, Satan can never be thought to have any hand; and therefore the suggestion that Christ casts out devils by his assistance, even out of the bodies of men, has no show of reason in it.