“If I believe in Christ, regardless of how sin may trouble me to the point of despair, I shall rely on the liberty I have in Christ and say: “I admit that I have sinned. But my sin (which is a sin that is damned) is in Christ (who is a sin that damns). This sin that damns is stronger than the sin that is damned; for it is justifying grace, righteousness, life, and salvation.” And so when I feel the terrors of death, I say: “Death, you have nothing on me. For I have another death, one that kills you, my death. And the death that kills is stronger than the death that is killed.” Thus the believer can raise himself up through faith alone and gain a comfort that is sure and firm; and he need not grow pale at the sight of sin, death, the devil, or any evil. The more the devil attacks him with all his force and tries to overwhelm him with all the terrors of the world, the more hope he acquires in the very midst of all these terrors and says: “Mr. Devil, 80 do not rage so. Just take it easy! For there is One who is called Christ. In Him I believe. He has abrogated the Law, damned sin, abolished death, and destroyed hell. And He is your devil, you devil, because He has captured and conquered you, so that you cannot harm me any longer or anyone else who believes in Him.” The devil cannot overcome this faith, but he is overcome by it. For “this,” says John (1 John 5:4-5), “is the victory that overcomes the world, our faith. Who is it that overcomes the world but he who believes that Jesus is the Son of God?
Martin Luther – Luther’s Works, Vol. 26: Lectures on Galatians Chapters 1-4