Tom Schreiner has a helpful article on Preaching and Biblical Theology in the latest Southern Baptist Journal of Theology.
Here is his conclusion, which is a good summary of his article:
"Our task as preachers is to proclaim the whole counsel of God. We will not fulfill our calling if as preachers we fail to do biblical theology. We may get many compliments from our people for our moral lessons and our illustrations, but we are not faithfully serving our congregations if they do not understand how the whole of scripture points to Christ, and if they do not gain a better understanding from us of the storyline of the Bible. May God help us to be faithful teachers and preachers, so that every person under our charge will be presented perfect in Christ."
And here's a summary of the way in which Schreiner calls upon preachers to take up the task of preaching that is informed by "antecedent theology" and "canonical theology":
"The first task of every interpreter is to read the OT in its own right, discerning the meaning of the biblical author when it was written. Further, as we argued above, each OT book must be read in light of its antecedent theology, so that the storyline of scripture is grasped. But we also must read all of scripture canonically, so that the OT is read in light of the whole story—the fulfi llment that has come in Jesus Christ. We always consider the perspective of the whole, of the divine author in doing biblical theology and in the preaching of God’s word. We read the scriptures both from front to back and back to front. We always consider the developing story as well as the end of the story."
Read the whole thing.
(HT: Jim Hamilton)