Induce Your Hearers To Do God's Will By Preaching The Gospel

“Let no minister think that he cannot induce the unwilling to do God’s will by preaching the Gospel to them and that he must rather preach the Law and proclaim the threatenings of God to them. If that is all he can do, he will only lead his people to perdition. Rather than act the policeman in his congregation, he ought to change the hearts of his members in order that they may without constraint do what is pleasing to God with a glad and cheerful heart. A person who has a real understanding of the love of God in Christ Jesus is astonished at its fire, which is able to melt anything in heaven and on earth. The moment he believes in this love he cannot but love God and from gratitude for his salvation do anything from love of God and for His glory. It is a useless effort to try to soften with laws and threatenings such hearts as are not melted by having the love of God in Christ Jesus presented to them. The best preachers are those who in this respect do as Luther did, such as preach the Law only accomplish nothing. In such measure as you exhibit the Law in its spiritual meaning, in that measure you sink your hearers into despair, but do not make them willing to serve God.” 

-C.F.W. Walther. Thesis 23 of The Proper Distinction Between Law and Gospel