The doctrine of the Trinity seems difficult to understand today. In the New Testament, there is a unity of revelation and action between Father, Son, and Holy Spirit, although a unity of essence is not clearly expressed. We can discern the Old Testament roots of the implied divinity of Jesus and also of the divinity of the Spirit. Yet, from these manifestations of the one God it is difficult to arrive at a doctrine of the Trinity. While the metaphysical terminology of the early church leads to

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... uch a doctrine, the biblical witness could only arrive at a doctrine of the Trinity in a mediated way. It suffices that there is a unity of action of Father, Son, and Holy Spirit, without the need to fathom the mysteries of the Trinity with regard to their exact mutual relations and their status over against each other. As the New Testament affirms, decisively is that God was and is in Christ for our salvation and that God is present through his Holy Spirit so that there is life.