Luther on Galatians 5:19

"The fatuous idea that a person can be holy by himself denies God the pleasure of saving sinners. God must therefore first take the sledge-hammer of the Law in His fists and smash the beast of self-righteousness and its brood of self-confidence, self wisdom, and self-help. When the conscience has been thoroughly frightened by the Law it welcomes the Gospel of grace with its message of a Savior Who came–not to break the bruised reed nor to quench the smoking flax–but to preach glad tidings to the poor, to heal the broken-hearted, and to grant forgiveness of sins to all the captives."
– Martin Luther
Luther's commentary on Galatians (specifically 3.19)