St. Paul [in Ephesians 1:7] uses two words to express how we are reconciled to God. First he sets down the ransom or redemption, which amounts to the same thing, and afterwards he sets down the forgiveness of sins. How then does it come about that God’s wrath is pacified, that we are made at one with him, and that he even accepts and acknowledges us as his children? It is by the pardoning of our sins, says St. Paul. And furthermore, because pardon necessitates redemption he yokes the two together. The truth is that, in respect of us, God blotted out our sins of his own free goodness and shows himself altogether bountiful, and does not look for any payment for it at our hands. And, in fact what man is able to make satisfaction for the least fault that he has committed? If every one of us, therefore, should employ his whole life in making satisfaction for any one fault alone, and by that means seek to win favor at God’s hand, it is certain that such a thing far surpasses all our abilities. And therefore God must necessarily receive us to mercy without looking for any recompense or satisfaction at our hands.
But, for all this, the atonement, which is freely bestowed in respect of us, cost the Son of God very dear (I Peter 1:19). For he found not other payment than the shedding of his own blood, so that he made himself our surety in both body and soul, and answered for us before God’s judgment to win absolution for us. Our Lord Jesus Christ entered into the work, both body and soul. For it would not have been enough for him to have suffered so cruel and ignominious a death in the sight of men, but it was necessary for him also to bear such horrible anguish in himself, as if God had become his judge, for he gave himself up in the behalf of sinners to make full satisfaction.