Always in some way they will throw light on the twin themes of sin and grace; for these are the things that the whole Bible is about.Whatever part of the counsel of God they deal with, expository sermons will relate it to “Christ and him crucified,” for the Christ of Calvary is, so to speak, the hub around which the whole Biblical revelation revolves.And the preacher is not handling his texts biblically unless he is seeing and setting them in their proper relation to Christ. If the expositor finds himself out of sight of Calvary, that shows that he has lost his way.
J.I. Packer
From the book “Honouring the Written Word of God: 3 (Collected Shorter Writings of J. I. Packer)”