Over at Euangelion, Joel Willitts has written a couple of posts on doing Biblical Theology. I think Joel’s intuitions are correct that a typological approach tends to exalt “fulfilment” to the neglect of the “type.” Willitts wants to show the meaning and the significance of the “new” is profoundly shaped by understanding the “old.” He writes:

The new event is in the shape of the archetype and thereby embodying its importance. The idea is that the new event’s significance is dependent on the significance of the old event. The new event is “another manifestation of the basic archetype”. The new derives significance in relation to the old.

Be sure to read his whole post here.