There is a principle here for us: we cannot live in a way that contradicts our message. So we think of that famous Marshall McLuhan statement from the 1960s – ‘The medium is the message’. The medium that is selected for conveying a message, influences the hearer’s perception of the message enormously. The preacher can talk about Christ, the fall of man, the need for redemption; he can talk about the atoning blood of Christ on Calvary, and the possibility of the new birth by repentance and faith, and salvation and everlasting life. But if on the platform there is a choir of half-naked girls and fellows, and all the crashing racket of rock 'n' roll, and heavy metal, and the lot; if there is the world everywhere, what will the hearer of the message understand? He will hear the preacher saying, ‘Don't you know, you can have Christ; you can be covered by shed blood; you can be saved and go to heaven, and at the same time you can keep the world. He never said that literally, but really he did say that, because the medium was the world, and the two things are fused together in the mind of the hearer. You cannot be a worldling and an evangelist. It is absolute madness to try. It is against the word of God; it is against common sense, and yet it is so common today. It's crazy, it's godless, and it's wrong, and it misrepresents the Lord. So we derive these things from Scripture. It is not mere opinion. It is the standard of the Scripture, and it is a lesson found here in the Book of Jeremiah.