This book treats a decisive phase in the theological history of the fourth century AD. When in 360 the 'Arians' Aetius and Eunomius maintained the difference in essences between the Father and the Son and the created nature of the Holy Spirit, the theologians of Nicaean orthodoxy were challenged to develop a theory of the Homousia of the Father, Son and Holy Ghost which paved the way to the Trinitarian doctrinal decisions of the Council of Constantinople in 381.
The two books Adversus Eunomium IV-V probably form the first literary reaction to the 'Neo-Arians' and set the tone for the...