Sidney Greidanus has written a few books that touch on the challenge of theocentric preaching. In The Modern Preacher and the Ancient Text, he argues that the Bible's purpose is to primarily tell God's story, which intersects at points with ours:
In contrast to anthropocentric interpretation, therefore, theocentric interpretation would emphasize that the Bible's purpose is first of all to tell the story of God. In relating that story, the Bible naturally also depicts many human characters – not, however, for their own sake but for the sake of showing what God is doing for, in, and through them. Hence, when preachers pass on the biblical story, they ought to employ biblical characters the way the Bible employs them, not as ethical models, not as heroes for emulation or examples for warning, but for people whose story has been take up into the Bible in order to reveal what God is doing for and through them.