This study refutes the ordinary description of St Gregory as would-be philosopher in the Greek tradition. First, it describes the world-view of the holy Fathers, holding that it is to their fellowship that he belonged, not the Platonic tradition of the philosophies of Plotinus, Philo, and Origen of Alexandria. Chapters compare St Gregory to these alleged models and sources, and it is argued that he matches none of them. The study also holds that the works of St Gregory were adulterated by his enemies, probably during the 6th-century Origenist revival, as his orthodoxy was never questioned by anyone until the time that the latter followers of Origen associated him with their cause. This study seeks to open up a new direction in the study of religion and contribute to the "rehabilitation" of St Gregory and the Christian tradition to which he was a pre-eminent witness.