A. D. Nock's Conversion and William James' Varieties of Religious Experience are the two most cited books in the field of conversion studies.
(Lewis R. Rambo, San Francisco Theological Seminary/Graduate Theological Union)
From the time when each petty State had its peculiar set of local deities down to the final triumph of the Catholic Church, [Nock] traces the history, and to some extent the psychology, of the processes by which religions were gradually syncretized and their minor differences canceled out.
(Odell Shepard New York Times
There has been so much loose writing and talking in recent times about the relation of the so-called mystery religions to Christianity that Professor Nock's erudite and sympathetic presentation of the points of likeness and unlikeness between them... is a very valuable contribution to the history of religion.
(Times Literary Supplement
The reader will find much to fascinate him in the author's development of this theme. With a sure hand he traces the ways by which Eastern religious ideas penetrated the West, following paths of trade, carried by soldiers from one end of the empire to the other, communicated by Oriental slaves to Roman masters.
(Campbell Bonner The Saturday Review of Literature
About the Author
Arthur Darby Nock (1902-1963) was the Frothingham Professor of the History of Religion at Harvard University. He was for years one of the world's leading authorities on the religions of later antiquity. He is also the author of Early Gentile Christianity and Its Hellenistic Background and Essays on Religion and the Ancient World.