With the term "Trinity," a key concept of the ecumenical community, only a few people can connect something concrete. Many associate it with a form of polytheism. The author demonstrates how the Christian belief in God had to gradually shape its profile in the confrontation with the religious and philosophical currents of the first centuries. He illustrates how the conceptual model of the "divine Trinity" emerged in this process, what it expresses, and how the Christian understanding of God differs from others. Readers will thus be able to assess the significance of the doctrine of the Trinity for their own understanding of God. A comprehensible, theologically grounded presentation!.