It is vital that the listener be able to see how the message comes from the text they are looking at. The credibility of the speaker matters, but the credibility of the Bible matters more. It matters that people listening to a sermon can look at the text before them and see how the message flows from that particular text. It is not good enough to preach truth, or to preach a sound idea. It matters that the truth and the idea come from the text presented to the people.
Some years ago my wife and I sat in church as the visiting preacher preached the gospel. The message was true, the gospel was clear. But the message was not true to that text, and the gospel was not clear from that text. His “clever” presentation of the gospel undermined the very credibility of the gospel he proclaimed.
Since you’re wondering, he preached the gospel using the three phrases from Job 41:8. First point was that we must identify with Christ (lay your hand on him). Second point, that we must remember what He did for us (remember the battle). Third point was that our salvation is not dependent on us, but on Him, there is no need to keep “getting saved” again (and you will do it no more). The text is not presenting the gospel, it is God telling Job to get in the squared circle and slug it out with leviathan.
May our listeners never leave saying, “Great message, but I don’t see how he got that message from that text!”
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