In the Bible all authority belongs to God and is then delegated to Jesus. … The phrase authority of scripture can only, at its best, be a shorthand for the authority of God in Jesus, mediated through scripture. … [A]s centuries of history demonstrate, the Bible is the God-given means through which we know who Jesus is. Take the Bible away, diminish it or water it down, and you are free to invent a Jesus just a little bit different from the Jesus who is hidden in the Old Testament and revealed in the New. We live under scripture because that is the way we live under the authority of God that has been vested in Jesus the Messiah, the Lord.
This is the big story that we must learn how to tell. It isn’t just about how to get saved, with some cosmology bolted on the side. This is an organic story about God and the world. God’s authority is exercised not to give his people lots of true information, not even true information about how they get saved (though that comes en route). God’s authority, vested in Jesus the Messiah, is about God reclaiming his proper lordship over all creation. And the way God planned to rule over his creation from the start was through obedient humanity. The Bible’s witness to Jesus declares that he, the obedient Man, has done this. But the Bible is then the God-given equipment through which the followers of Jesus are themselves equipped to be obedient stewards, the royal priesthood, bringing that saving rule of God in Christ to the world.
N.T. Wright, Surprised by Scripture: Engaging Contemporary Issues, pp. 28-29.