3:14,15 God passes sentence; and he begins where the sin began, with the serpent. The devil's instruments must share in the devil's punishments. Under the cover of the serpent, the devil is sentenced to be degraded and accursed of God; detested and abhorred of all mankind: also to be destroyed and ruined at last by the great Redeemer, signified by the breaking of his head. War is proclaimed between the Seed of the woman and the seed of the serpent. It is the fruit of this enmity, that there is a continual warfare between grace and corruption, in the hearts of God's people. Satan, by their corruptions, buffets them, sifts them, and seeks to devour them. Heaven and hell can never be reconciled, nor light and darkness; no more can Satan and a sanctified soul. Also, there is a continual struggle between the wicked and the godly in this world. A gracious promise is here made of Christ, as the Deliverer of fallen man from the power of Satan. Here was the drawn of the gospel day: no sooner was the wound given, than the remedy was provided and revealed. This gracious revelation of a Saviour came unasked, and unlooked for. Without a revelation of mercy, giving some hope of forgiveness, the convinced sinner would sink into despair, and be hardened. By faith in this promise, our first parents, and the patriarchs before the flood, were justified and saved. Notice is given concerning Christ. 1. His incarnation, or coming in the flesh. It speaks great encouragement to sinners, that their Saviour is the Seed of the woman, bone of our bone, Heb 2:11,14. 2. His sufferings and death; pointed at in Satan's bruising his heel, that is, his human nature. And Christ's sufferings are continued in the sufferings of the saints for his name. The devil tempts them, persecutes and slays them; and so bruises the heel of Christ, who is afflicted in their afflictions. But while the heel is bruised on earth, the Head is in heaven. 3. His victory over Satan thereby. Christ baffled Satan's temptations, rescued souls out of his hands. By his death he gave a fatal blow to the devil's kingdom, a wound to the head of this serpent that cannot be healed. As the gospel gains ground, Satan falls.
15. thy seed—not only evil spirits, but wicked men.
seed of the woman—the Messiah, or His Church [Calvin, Hengstenberg].
I will put enmity between thee and the woman—God can only be said to do so by leaving "the serpent and his seed to the influence of their own corruption; and by those measures which, pursued for the salvation of men, fill Satan and his angels with envy and rage."
thou shalt bruise his heel—The serpent wounds the heel that crushes him; and so Satan would be permitted to afflict the humanity of Christ and bring suffering and persecution on His people.
it shall bruise thy head—The serpent's poison is lodged in its head; and a bruise on that part is fatal. Thus, fatal shall be the stroke which Satan shall receive from Christ, though it is probable he did not at first understand the nature and extent of his doom.