Christopher Beeley's book sheds new light on important aspects of Gregory's theology. But the major contribution of his argument is to show persuasively how all Gregory's doctrinal themes cohere in his soteriological understanding of the Trinity, an understanding that Beeley carefully locates in Gregory's own experience both as a Christian leader in controversial times and as a Christian thinker informed by scripture and by the classical Greek heritage. The book demonstrates how, for Gregory, the Trinity not only frames the entire Christian message of salvation but also functions as the wellspring for the spiritual life and for pastoral care.