Wherein in time past ye walked according to the course of this world, according to the prince of the power of the air, the spirit that now worketh in the children of disobedience: Wherein in time past ye walked - There is much force in these expressions; the Ephesians had not sinned casually, or now and then, but continually; it was their continual employment; they walked in trespasses and sins: and this was not a solitary case, all the nations of the earth acted in the same way; it was the course of this world, κατα τον αιωνα του κοσμου τουτου, according to the life, mode of living, or successive ages of this world. The word αιων, the literal meaning of which is constant duration, is often applied to things which have a complete course, as the Jewish dispensation, a particular government, and the term of human life; so, here, the whole of life is a tissue of sin, from the cradle to the grave; every human soul, unsaved by Jesus Christ, continues to transgress. And the nominally Christian world is in the same state to the present day. Age after age passes on in this way and the living lay it not to heart!
The prince of the power of the air - As the former clause may have particular respect to the Jewish people, who are frequently denominated עולם הזה olam hazzeh, this world, this latter clause may especially refer to the Gentiles, who were most manifestly under the power of the devil, as almost every object of their worship was a demon, to whom the worst of passions and practices were attributed, and whose conduct his votaries took care to copy.
Satan is termed prince of the power of the air, because the air is supposed to be a region in which malicious spirits dwell, all of whom are under the direction and influence of Satan, their chief.
The spirit that now worketh - Του νυν ενεργουντος The operations of the prince of the aerial powers are not confined to that region; he has another sphere of action, viz. the wicked heart of man, and in this he works with energy. He seldom inspires indifference to religion; the subjects in whom he works are either determinate opposers of true religion, or they are systematic and energetic transgressors of God's laws.
Children of disobedience - Perhaps a Hebraism for disobedient children; but, taken as it stands here, it is a strong expression, in which disobedience, ἡ απειθεια, appears to be personified, and wicked men exhibited as her children; the prince of the power of the air being their father, while disobedience is their mother. Thus they are emphatically, what our Lord calls them, Matthew 13:38, children of the wicked one; for they show themselves to be of their father the devil, because they will do his works, John 8:44. Some think that by children of disobedience the apostle means particularly the disobedient, unbelieving, refractory, and persecuting Jews; but I rather think he speaks this generally, and refers to the Jews in the following verse.