Bonhoeffers Theology, Negative and Positive
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Negative theology holds that the human maind can
no nothing about God, and that the only characteristic
of deity which is reliable is that it cannot be characterized.
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Positive theology has no such traditional definition, but may,
for purposes of exposition conveniently be defined as
the negation of negative theology,
namely the assertion that the features of deity and 
its will its perception are indeed knowable,
inwardly by inspiration or outwardly by manifestation.
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The history of Jewish theology may be interpreted as
the continuing dialectical interplay of these two
mutually exclyusive assertions. 
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The Bible begins with the bold assertion of the similarity
between God and man. God made man in his own image.
The God so described  was like a landlord who banished
two disobediant tenants from his garden for spoiling
his favorite tree; a powerful ruler who drowned almost all 
his subjects (except Noah) for their disloyalty or disobedience,
who tested the loyalty of his chosen subject Abraham by demanding
that he sacrifice his son Isaac, and who as the ruler of
his people engaged in international rivalry with 
another ruler, Pharaoh, to prove himself the stronger.
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And then God gave the Ten Commandments which prohibited
his people from making images (of him) and even from 
pronouncing his name. These commandments are the roots
of negative theology. It was Philo, in the early Christian
era, who formulated this theology explicitly ....
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The notion of negative theology is also useful in interpreting
Bonhoeffers work. I mention two examples that are of particular
interest to me.
The non-specific invocation of God, and especially of Jesus Christ.
I mention two examples. The use of a magic formula as indicative
of the infinity and unspeakableness of God.

The antinomy of absolute and situational ethics which has
already been commented upon.
On the one hand the catalogue of mandates
on the other hand the rejection of law and legality.
Within the mandates, internally,
the incongruities and contradictions.
the competing claims of authority and conscience.
Conscientious objection to war?
The legitimation of killing under some circumstances.
The absolute distinction between human and animal life.
If these mandates are from God,
then they are characterizations of his mind,
of his purposes.

With the incarnation God appears to become
irrevocably anthropomorphic.