Creation & New Creation in the New Testament by N.T. Wright
(4 Lectures on tape or CD)
This lecture series has rocked my theological world! Understanding the concepts Wright advances here is revolutionizing my categories—the Resurrection is the beginning of the "New Creation," and our cooperating with God in the advancement of the Kingdom of God is watching the re-creation of humanity and the world.
My eschatology will never be the same (that may be a good thing or a bad thing!), and my hope in Christ has been deepened immensely.