Luther: But where Christ is truly seen, there there must be full and perfect joy in the Lord and peace of heart, where the heart declares: “Although I am a sinner according to the Law, judged by the righteousness of the Law, nevertheless I do not despair. I do not die, because Christ lives who is my righteousness and my eternal and heavenly life. In that righteousness and life I have no sin, conscience, and death. I am indeed a sinner according to the present life and its righteousness, as a son of Adam where the Law accuses me, death reigns and devours me. But above this life I have another righteousness, another life, which is Christ, the Son of God, who does not know sin and death but is righteousness and eternal life. For His sake this body of mine will be raised from the dead and delivered from the slavery of the Law and sin, and will be sanctified together with the spirit.”
Martin Luther, Luther’s Works, Vol. 26: Lectures on Galatians, 1535, Chapters 1-4, ed. Jaroslav Jan Pelikan, Hilton C. Oswald, and Helmut T. Lehmann (Saint Louis: Concordia Publishing House, 1999), 8–9.