‘When the devil tells us we are sinners and therefore damned, we may answer, “Because you say I am a sinner, I will be righteous and saved.” Then the devil will say, “No, you will be damned.” And I will reply, “No, for I fly to Christ, who has given himself for my sins. Satan, you will not prevail against me when you try to terrify me by telling me how great my sins are and try to reduce me to heaviness and despair. On the contrary, when you say I am a sinner, you give me armor and weapons against yourself, so that I can cut your throat with your own sword and tread you under my feet, for Christ died for sinners. My sin is on his shoulders, not mine. So when you say I am a sinner, you do not terrify me but comfort me immeasurably.’

-Martin Luther, commenting on Galatians 1:4

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(GSiV: Luther; Key materials on gospel grace )