“It would be presumptuous to call this work a philosophy of religion, but it is a first step in that direction. There is a reciprocal relation between science and religion which I try to trace in parts one and two, intending to show that neither can maintain itself in adequate manner without the other. In part three I endeavor to clear away from the face of religion what I believe to be certain present-day misinterpretations of it and to state my own view of its function in human living.” —From the Preface to this Edition
“An unusually suggestive study.”—Journal of Religion
“The discussion is suggestive and interesting even when least convincing.”—New York Herald Books