Spirit of Adoption

I have posted this quote before but I just finished Church History II at RTS and came across it again. This is from Luther's commentary on Galatians; he is answering the question, How do we comfort an afflicted sinner?

“We comfort the afflicted sinner in this manner: Brother, you can never be perfect in this life, but you can be holy. He will say: "How can I be holy when I feel my sins?" I answer: You feel sin? That is a good sign. To realize that one is ill is a step, and a very necessary step, toward recovery. "But how will I get rid of my sin?" he will ask. I answer: See the heavenly Physician, Christ, who heals the broken-hearted. Do not consult that Quackdoctor, Reason. Believe in Christ and your sins will be pardoned. His righteousness will become your righteousness, and your sins will become His sins.” ~ from Commentary on Galatians 3:1-9