"Preaching Christ from the Old Testament means that we preach, not synagogue sermons, but sermons that take account of the full drama of redemption, and its realization in Christ. To see the text in relation to Christ is to see it in its larger context, the context of God's purpose in revelation. We do not ignore the specific message of the text, nor will it do to write an all-purpose Christocentric sermon finale and tag it for weekly use.
"You must preach Christ as the text presents him. If you are tempted to think that most Old Testament texts do not present Christ, reflect on both the unity of Scripture and the fullness of Jesus Christ. Christ is present in the Bible as the Lord and as the Servant."
Edmund P. Clowney, Preaching Christ in All of Scripture (Wheaton: Crossway, 2003), 11.