by Dr. Sinclair B. Ferguson
An important note in Ferguson's book The Whole Christ
"Who is the Christ who IS the gospel, and how is he equipped to save us?" 
Footnote  - As a codicil to this comment, we should also notice that knowing how to"preach Christ from the Old Testament," or understanding biblical theology, or seeing the flow of redemptive history, or knowing how to get to Christ from any part of the Scriptures does not necessarily result in actually preaching the person of Jesus Christ himself. Seeing Christ as the solution to a series of clues embedded in the Old Testament is not actually the same as proclaiming Jesus himself, in our flesh, bearing our sins, dying our death, and rising for our justification. A formula for preaching Christ is not identical to the persona of Christ, and we must never confuse hermeneutical principles with Christ himself. The former did not die for us on the cross; the latter did.
"If we are slow to grasp the distinction, its significance can be illustrated by reflecting on contemporary evangelical preaching and writing. Wherever the benefits of Christ are seen as abstractable from Christ himself, there is a decreasing stress on his person and work in preaching and in the books that are published to feed that preaching. This is accompanied by an increased stress on our experience of salvation rather than on the grace, majesty, and glory of the Lord Jesus Christ.
"Is it possible that most preachers reading these pages own more books on preaching (and even preaching Christ) than they own on Christ himself?
"If that is true (a survey would certainly be illuminating), we should probably ask a further question: Is it obvious to me, and of engrossing concern, that the chief focus, the dominant note in the sermons I preach (or hear), is "Jesus Christ and him crucified"? Or is the dominant emphasis (and perhaps the greatest energies of the preacher?) focused somewhere else, perhaps on how to overcome sin, or how to live the Christian life, or on the benefits to be received from the gospel? All are legitimate emphases in their place, but that place is never center stage. The same question can be asked more starkly in our techno-sermon age when many Christians listen not only to preaching in their own church but to their "favorite" preachers in the contemporary galaxy. Is the dominant theme, the lasting impression, the most natural word association, in relation to the preaching I hear "Jesus Christ and him crucified" -- or something else?"
Excerpt from The Whole Christ: Legalism, Antinomianism, and Gospel Assurance & Why the Marrow Controversy Still Matters by Sinclair Ferguson, pp 49-50