In Romans 6, Paul deals with the natural mind’s tendency to misunderstand the grace of God. “What shall we say then? Are we to continue in sin that grace may increase?”… The natural mind thinks, “If grace covers my sin, why not continue so that grace can be magnified?” Its definition of grace would be that grace frees me from the penalty of sin, so I can go satisfy myself with no fear of punishment. This is obviously tempting to those of us who experience the painful compulsion to indulge in addictive behaviors. But such an assumption is a total misunderstanding of the grace of God… The focus of God’s grace is not just on the penalty of my sin, but my bondage to sin on this side of heaven. Grace did not come just to pay my penalty so I could live in the bondage of working sin. It came to set me free from the power of sin in self-consciousness in my own life and even from my bondage to those who have sinned against me… God desires not only to free you from the penalty of sin but to free you from the power of sin. That’s why it is foolish to believe you can be a partaker of grace and continue on nonchalantly in a life of ungodliness.
Grace Works, Vine Books, 1992, 257-8, 263.