Contrition Will Not Earn You Salvation

Calvin, in the Institutes of the Christian Religion, 3.4.3:

But it makes a great difference whether you teach forgiveness of sins as deserved by just and full contrition, which the sinner can never perform; or whether you enjoin him to hunger and thirst after God's mercy to show him--through the recognition of his misery, his vacillation, his Weariness, and his captivity--where he ought to seek refreshment, rest, and freedom; in fine, to teach him in his humility to give glory to God.