In Romans 7, St. Paul says, "The law is spiritual." What does that mean? If the law were physical, then it could be satisfied by works, but since it is spiritual, no one can satisfy it unless everything he does springs from the depths of the heart. But no one can give such a heart except the Spirit of God, who makes the person be like the law, so that he actually conceives a heartfelt longing for the law and henceforward does everything, not through fear or coercion, but from a free heart.
Martin LutherTake this to heart and doubt not that you are the one who killed Christ. Your sins certainly did, and when you see the nails driven through his hands, be sure that you are pondering, and when the thorns pierce his brow, know that they are your evil thoughts.
Martin LutherIn our sad condition our only consolation is the expectancy of another life. Here below all is incomprehensible.
Martin Luther