To all preachers these words of the Savior have something very positive to say. We must not attempt to entertain men with all kinds of so-called sermons on social improvement. It brings no spiritual blessing to the hearts of sinners to hear discussions of political questions, of moral issues, of civic advancement, and, for that matter, any other temporal issue. What God wants sinners to hear is His Word. He tells preachers: "Preach the Word; be instant in season, out of season," 2 Tim. 4:2. You and I are to expose the sin and guilt of our hearers. With the hammer of God's holy Law we are to crush their hearts. We are to cause them to tremble that they may ask, "Sirs, what must I do to be saved?" Acts 16: 30. And then we must tell the story of Jesus and His love. We must lead poor sinners to the Cross of the Redeemer and tell them, "The Lord hath laid on Him the iniquity of us all," Is. 53:6. "The blood of Jesus Christ, His Son, cleanseth us from all sin," I John 1:7. "He hath made Him to be sin for us who knew no sin, that we might be made the righteousness of God in Him," 2 Cor. 5:21. Are you proclaiming this message? Or are you wasting your own time and the time of your hearers with subject matter that does not belong into the pulpit? Unless we proclaim the Word of God, we miss the mark altogether. Only the Word of God is "the power unto salvation," Rom. 1:16.
John Behnken, President of the LCMS 1945-1962, in "Mercies Manifold: Radio Messages Broadcast During the Summer of 1949, CPH 1950, pp. 117f.