“A Christian man is the most free lord of all, and subject to none, a Christian man is the most dutiful servant of all, and subject to every one.
“It is clear then that to a Christian man his faith suffices for everything, and that he has no need of works for justification. But if he has no need of works, neither has he need of the law; and if he has no need of the law, he is certainly free from the law, and the saying is true, ‘The law is not made for a righteous man’ (1 Tim. i. 9). This is that Christian liberty, our faith, the effect of which is, not that we should be careless or lead a bad life, but that no one should need the law or works for justification and salvation….
“[M]an does not live for himself alone in this mortal body, in order to work on its account, but also for all men on earth; nay, he lives only for others, and not for himself. For it is to this end that he brings his own body into subjection, that he may be able to serve others more sincerely and more freely….
“Yet a Christian has need of none of these things for justification and salvation, but in all his works he ought to entertain this view and look only to this object—that he may serve and be useful to others in all that he does; having nothing before his eyes but the necessities and the advantage of his neighbor.” — Martin Luther, The Freedom of a Christian