Know ye then- sin, death, devil, and everything that assails me- that you are missing the mark. I am not one of those who are afraid of you. For Christ, my dear Lord, has presented to me that triumph and victory of his by which you were laid low. And from this very gift of His I derive my name and am called a Christian. There is no other reason. My sin and death hung about His neck on Good Friday, but on the day of Easter they had completely disappeared. This victory He has bestowed on me. This is why I do not worry about you.
Source: Easter sermon, 1530, Mark 16:1-8 (What Luther Says, 3881)