Luther on Romans 6

In chapter 6, St. Paul takes up the special work of faith, the struggle which the spirit wages against the flesh to kill off those sins and desires that remain after a person has been made just. He teaches us that faith doesn't so free us from sin that we can be idle, lazy and self-assured, as though there were no more sin in us. Sin is there, but, because of faith that struggles against it, God does not reckon sin as deserving damnation. Therefore we have in our own selves a lifetime of work cut out for us; we have to tame our body, kill its lusts, force its members to obey the spirit and not the lusts. We must do this so that we may conform to the death and resurrection of Christ and complete our Baptism, which signifies a death to sin and a new life of grace. Our aim is to be completely clean from sin and then to rise bodily with Christ and live forever. 

St. Paul says that we can accomplish all this because we are in grace and not in the law. He explains that to be "outside the law." is not the same as having no law and being able to do what you please. No, being "under the law" means living without grace, surrounded by the works of the law. Then surely sin reigns by means of the law, since no one is naturally well-disposed toward the law. That very condition, however, is the greatest sin. But grace makes the law lovable to us, so there is then no sin any more, and the law is no longer against us but one with us. 

This is true freedom from sin and from the law; St. Paul writes about this for the rest of the chapter. He says it is a freedom only to do good with eagerness and to live a good life without the coercion of the law. This freedom is, therefore, a spiritual freedom which does not suspend the law but which supplies what the law demands, namely eagerness and love. These silence the law so that it has no further cause to drive people on and make demands of them. It's as though you owed something to a moneylender and couldn't pay him. You could be rid of him in one of two ways: either he would take nothing from you and would tear up his account book, or a pious man would pay for you and give you what you needed to satisfy your debt. That's exactly how Christ freed us from the law. Therefore our freedom is not a wild, fleshy freedom that has no obligation to do anything. On the contrary, it is a freedom that does a great deal, indeed everything, yet is free of the law's demands and debts. 

- "Vorrede auff die Epistel S. Paul: an die Romer." in D. Martin Luther: Die gantze Heilige Schrifft Deudsch 1545 aufs new zurericht, ed. Hans Volz and Heinz Blanke. Munich: Roger & Bernhard. 1972, vol. 2, pp. 2254-2268. This translation was made by Bro. Andrew Thornton, OSB, for the Saint Anselm College Humanities Program. ©1983 by Saint Anselm Abbey.