Norgate assesses the way in which the Christian doctrine of the Trinity is the foundation for all other Christian doctrines, especially the Christian understanding of salvation. He investigates in detail the approach of the German Lutheran theologian, Isaac A. Dorner (1809-1884) to this question. Analysis of his arguments concerning the priority of the doctrine of God for Christian belief and dogmatics is given. It examines the form of his doctrine of Gods triunity, and gives an extensive study of how Dorners particular account of Gods triune identity informs the Christian conception of Gods relation to the world, first, as Creator and, second, as Saviour. In this process, it seeks to refocus attention on Dorner as a major figure in the development of modern theology.