All of scripture is about Jesus, as we see in Luke 24:13-27. And since I firmly believe in expository preaching, and that Christ is the centre of the Bible, there is only one conclusion, that Christ must be the centre of every sermon.
Recently Tony Reinke blogged a few choice quotes from Spurgeon regarding his opinion on Christless preaching, this being the general flavour of the quotes:
The motto of all true servants of God must be, “We preach Christ; and him crucified.” A sermon without Christ in it is like a loaf of bread without any flour in it. No Christ in your sermon, sir? Then go home, and never preach again until you have something worth preaching.
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I heartily agree with the sentiment, and the one thing that frequently appears in my sermon notebook is the phrase what about the cross?. It warms my heart to know that most of the time when I write that down, the preacher goes on to answer it later in the sermon.
As I blogged a few days ago, the gospel is the answer to every problem in the world, so what use is a sermon without the gospel in it? What use is a Biblical view on an issue if that view does not include the cross.