Wrath and judgment are shown through the Law to keep us from sinning. But when we have fallen, we have the Word of promise by which we are taught not to despair but to bear in mind that the goodness and mercy of God are boundless. He gave His Son for us that He should be our satisfaction and that by His blood our sin should be devoured and destroyed.
Luther’s works, vol. 8: Lectures on Genesis: Chapters 45-50