The apostasy of the Galatians is a fine endorsement of the Law, all right. You may preach the Law ever so fervently; if the preaching of the Gospel does not accompany it, the Law will never produce true conversion and heartfelt repentance. We do not mean to say that the preaching of the Law is without value, but it only serves to bring home to us the wrath of God. The Law bows a person down. It takes the Gospel and the preaching of faith in Christ to raise and save a person.
Martin Luther on Galatians 3:1
Law, Grace, & Daily Living 