If persons are relations of a simple essence,
* How does such a relation become incarnate?
* Does this relation have a relation to the human nature?
* If two (or three) of the persons are relations, then are there relations between the relations? How does this not entail gnosticism with its endlessly multiplied hypostases?
I suppose one could get around this by saying that the term “relation” takes on a different meaning (albeit with no warning).
Logical Investigations 
I’m usually disappointed with Reformed trinitarian theolegoumena because it so heavily depends upon Augustine, who was a disaster. Which Reformed theologians best got away from the Augustinian heritage, or sufficiently repackaged it, in your opinion? With the exception of Torrance.
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Though Robert Letham’s book on the Trinity is flawed, he at least sees the problem. Colin Gunton is too much of a Barthian, but he, too, sees the problem with Augustine.
At the end of the day the best Reformed Trinitarian theology is Torrance.
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