The role of Scripture in Christ-centered preaching

What is the role of Scripture in Christ-centered (trinitarian) preaching? Consider the following from Eugene Peterson (quoted from “Living into God’s Story” - click here to read the full paper):

Scripture…does not so much present us with a moral code and tell us, "Live up to this," nor does it set out a system of doctrine and say, "Think like this." The biblical way is to tell a story and invite us, "Live into this - this is what it looks like to be human in this God-made and God-ruled world; this is what is involved in becoming and maturing as a human being."

We don't have to fit into prefabricated moral and mental or religious boxes before we are admitted into the company of God. We are taken seriously just as we are and given place in his story - for it is, after all, God's story. None of us is the leading character in the story of our lives. God is the larger context and plot in which all our stories find themselves.
How can we most effectively use Scripture as story to tell the Good News of our inclusion through and with Jesus in God's story?