This work investigates the historical and theological significance of the Montanist movement within early Christianity. Ronald E. Heine, a scholar of early church history, presents a comprehensive examination of the Montanist oracles and testimonia, drawing on primary source materials to reconstruct their beliefs and practices. The book aims to provide a clear understanding of Montanism's unique prophetic claims and its eventual condemnation by the broader Christian church.

This scholarly work is recognized for its rigorous academic approach to a complex and controversial early Christian movement. Scholars typically regard Heine's compilation and analysis of the Montanist oracles and testimonia as a foundational resource for understanding the movement's historical trajectory and theological challenges. The book is considered essential for those studying heterodox movements within early Christianity and the development of orthodox doctrine.