It is possible that all this might disquiet the minds of those who have been wont to assume perfection in the primitive Christian church, and who assume also that present-day Christianity is the ultimate form of the Christian religion. Such persons--if there are {xiv} such--should rather take heart from the whole-souled devotion to truth everywhere to be seen in the works of scholars in ancient religion, and from their equally evident sympathy with all manifestations of human effort to establish the divine relation; but most of all from their universal testimony that for all time and in all places and under all conditions the human heart has felt powerfully the need of the divine relation. From the knowledge that the desire to get right with God--the common and essential element in all religions--has been the most universal and the most potent and persistent factor in past history, it is not far to the conviction that it will always continue to be so, and that the struggle toward the divine light of religion pure and undefiled will never perish from the earth. GRANT SHOWERMAN. THE UNIVERSITY OF WISCONSIN. * * * * * Notes to Introduction. [1] This summary of M. Cumont's chapter is quoted from my review of the first edition of _Les religions orientales_ in _Classical Philology_, III, 4, p. 467. [2] _Die Religion der Roemer_, p. 116. For the significance of the pagan faiths, see an essay on "The Ancient Religions in Universal History," _American Journal of Philology_, XXIX, 2. pp. 156-171. * * * * * {xv} PREFACE. In November, 1905, the College de France honored the writer by asking him to succeed M. Naville in opening the series of lectures instituted by the Michonis foundation. A few months later the "Hibbert Trust" invited him to Oxford to develop certain subjects which he had touched upon at Paris. In this volume have been collected the contents of both series with the addition of a short bibliography and notes intended for scholars desirous of verifying assertions made in the text.[1] The form of the work has scarcely been changed, but we trust that these pages, intended though they were for oral delivery, will bear reading, and that the title of these studies will not seem too ambitious for what they have to offer. The propagation of the Oriental religions, with the development of neo-Platonism, is the leading fact in the moral history of the pagan empire. May this small volume on a great subject throw at least some light upon this truth, and may the reader receive these essays with the same kind interest shown by the audiences at Paris and Oxford.