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Concerning Christian Liberty
The Blessed Virgin beyond all others, affords us an example of the same faith, in that she was purified according to the law of Moses, and like all other women, though she was bound by no such law and had no need of purification. Still she submitted to the law voluntarily and of free love, making herself like the rest of women, that she might not offend or throw contempt on them. She was not justified by doing this; but, being already justified, she did it freely and gratuitously. Thus ought our works too to be done, and not in order to be justified by them; for, being first justified by faith, we ought to do all our works freely and cheerfully for the sake of others.
St. Paul circumcised his disciple Timothy, not because he needed circumcision for his justification, but that he might not offend or contemn those Jews, weak in the faith, who had not yet been able to comprehend the liberty of faith. On the other hand, when they contemned liberty and urged that circumcision was necessary for justification, he resisted them, and would not allow Titus to be circumcised. For, as he would not offend or contemn any one's weakness in faith, but yielded for the time to their will, so, again, he would not have the liberty of faith offended or contemned by hardened self-justifiers, but walked in a middle path, sparing the weak for the time, and always resisting the hardened, that he might convert all to the liberty of faith. On the same principle we ought to act, receiving those that are weak in the faith, but boldly resisting these hardened teachers of works, of whom we shall hereafter speak at more length.
Christ also, when His disciples were asked for the tribute money, asked of Peter whether the children of a king were not free from taxes. Peter agreed to this; yet Jesus commanded him to go to the sea, saying, "Lest we should offend them, go thou to the sea, and cast a hook, and take up the fish that first cometh up; and when thou hast opened his mouth thou shalt find a piece of money; that take, and give unto them for Me and thee" (Matt. xvii. 27).
This example is very much to our purpose; for here Christ calls Himself and His disciples free men and children of a King, in want of nothing; and yet He voluntarily submits and pays the tax. Just as far, then, as this work was necessary or useful to Christ for justification or salvation, so far do all His other works or those of His disciples avail for justification. They are really free and subsequent to justification, and only done to serve others and set them an example.