Triune concreteness

Hegel writes that the Trinity enables Christianity and especially Christian art to attain a concreteness impossible in Judaism and Islam: “When we state . . . of God thathe is simple One, the Supreme Being as such, we have thereby merely given utterance to a lifeless abstraction of the traditional understanding.  Such a God, as He is thus not conceived in His concrete truth, can supply no content for art, least of all plastic art.  Consequently neither the Jews nor the Turks have been able to represent their God, who is not even an abstraction of the understanding in the above sense, under the positive mode in which Christians have represented Him.  For in Christianity God is conceived in HIs truth, and as such essentially concrete, as personality, or as the subjective focus of conscious life, or, more accurately defined, as Spirit.  And what He is as Spirit is made explicit to the religious apprehension as a trinity of persons, which at the same time are, in their independence, regarded as One.  Here is essentiality, universality, and particularity, no less than their reconciled unity, and it is only a unity such as this that give us the concrete.”