As a discipline biblical-theology often assumes a wide variety of expressions. Yet at the heart of each of these expressions is the overriding presupposition that the rich diversity of Scripture serves its profound unity. Further, this “diversity within unity” is most clearly seen through a consideration of the historical development of theological themes. And, this historical progression of ideas runs from one end of the Bible to the other. In other words, the entire Bible is moving, growing according to a common purpose and towards a common goal (thus we can say that the whole Bible is “eschatological”).