Civil laws and ordinances have their place and purpose. Let every government enact the best possible laws. But civil righteousness will never deliver a person from the condemnation of God’s Law.
I have good reason for calling your attention to this. People easily mistake civil righteousness for spiritual righteousness. In civil life we must, of course, pay attention to laws and deeds, but in the spiritual life we must not think to be justified by laws and works, but always keep in mind the promise and blessing of Christ, our only Savior.
According to Paul everything that is not of faith is sin. When our opponents hear us repeat this statement of Paul, they make it appear as if we taught that governments should not be honored, as if we favored rebellion against the constituted authorities, as if we condemned all laws. Our opponents do us a great wrong, for we make a clear-cut distinction between civil and spiritual affairs.
Governmental laws and ordinances are blessings of God for this life only. As for everlasting life, temporal blessings are not good enough. Unbelievers enjoy more temporal blessings than the Christians. Civil or legal righteousness may be good enough for this life but not for the life hereafter. Otherwise the infidels would be nearer heaven than the Christians, for infidels often excel in civil righteousness.
Martin Luther, Galatians Commentary
Law, Grace, & Daily Living 