Listen to Paul’s words, that the observance of the Law overthrows the Gospel, and learn, if you continue to do this, how this comes to pass, and tremble, and shun this pitfall. How you still keep the sabbath, and fast with the Jews? Is it that you still fear the Law and abandonment of its letter? By doing this, you see faith as weak, and by itself powerless to save. A fear to omit the sabbath plainly shows that you fear the Law as still in force; and if the Law is needful, it is so as a whole, not in part, nor in one commandment only; and if as a whole, the righteousness which is by faith is little by little shut out. If you keep the sabbath, why not also be circumcised? and if circumcised, why not also offer sacrifices? If the Law is to be observed, it must be observed as a whole, or not at all.” (Homilies on Galatians 2:17 [A.D. 395]).