Genesis 3:15

And I will put enmity between thee and the woman and between thy seed and her Seed; it shall bruise thy head, and thou shalt bruise His heel. What was a curse for the serpent and for the devil, who had used the serpent for his disguise, was a glorious, comforting promise for fallen mankind, the first great Gospel proclamation: And enmity shall I set between thee and the woman and between thy seed and her Seed. This is not a mere reference to the aversion which most men feel for snakes of every kind, as some liberal commentators have it, but sets forth the cardinal truth of the ages. There would be everlasting and uncompromising enmity between the descendants of the woman, on the one hand, and the devil and all satanic powers, on the other. And this enmity, which would show itself in continual warfare, would finally have its culmination in the event that the one great Seed of the Woman, He to whom the entire Old Testament looks forward, would utterly crush the head of the serpent, of Satan, while the latter, in turn, would not be able to do more than crush the heel of the Victor. To overcome the devil, to annihilate his power, that is a feat beyond the ability of athis man; only God is able to do this. Christ, the promised Seed of the woman, born of the descendants of Eve, and yet the almighty God, is the strong Champion of mankind, who has delivered all men from the power of Satan and all his mighty allies. True, indeed, in doing so His heel was bruised, He was obliged to die, according to His human nature. But deliverance was effected, salvation was gained by the death of Jesus Christ on the cross, as the representative of all mankind.