But as the promise of bruising Satan’s head (Gen. 3:15) applies alike to Christ and to all his members, I deny that believers can ever be oppressed or vanquished by him. They are often, indeed, thrown into alarm, but never so thoroughly as not to recover themselves. They fall by the violence of the blows, but they get up again; they are wounded, but not mortally. In fine, they labour on through the whole course of their lives, so as ultimately to gain the victory, though they meet with occasional defeats.
John Calvin, Institutes of the Christian Religion 1.14.18