Then cast your sins from yourself upon Christ, believe with a festive spirit that your sins are his wounds and sufferings, that he carries them and makes satisfaction for them, as Is 53,6 says: “Jehovah hath laid on him the iniquity of us all;” and St. Peter in his first Epistle 2, 24: “Who his own self bare our sins in his body upon the tree” of the cross; and St. Paul in 2 Cor 5,21: “Him who knew no sin was made to be sin on our behalf; that we might become the righteousness of God in him.” Upon these and like passages you must rely with all your weight, and so much the more the harder your conscience martyrs you. For if you do not take this course, but miss the opportunity of stilling your heart, then you will never secure peace, and must yet finally despair in doubt. For if we deal with our sins in our conscience and let them continue within us and be cherished in our hearts, they become much too strong for us to manage and they will live forever. But when we see that they are laid on Christ and he has triumphed over them by his resurrection and we fearlessly believe it, then they are dead and have become as nothing. For upon Christ they cannot rest, there they are swallowed up by his resurrection, and you see now no wound, no pain, in him, that is, no sign of sin. Thus St. Paul speaks in Rom 4, 25, that he was delivered up for our trespasses and was raised for our justification; that is, in his sufferings he made known our sins and also crucified them; but by his resurrection he makes us righteous and free from all sin, even if we believe the same differently.
—Martin Luther, “A Good Friday Sermon on How to Contemplate Christ’s Holy Sufferings”