We will have to teach the following: that not only does humanity change in its relation to God, but the living relations of God to humanity…also undergo changes, as both are manifest in the world. And if we establish this point, then the concept of God is not merely the wooden concept of the highest being, but the vital absolute personality that stands in a living relation of mercy and love to the life of the worlds and its changing needs and conditions. Without reciprocity between God and world such vital relations would have no authentic reality.
The actual argument for mutual theism in church history, a 19th century German Lutheran by the name of August Dorner.
