We shall attempt to sketch this religious movement with its numerous and far-reaching ramifications. First we shall try to show what caused the diffusion of the Oriental religions. In the second place we shall examine those in particular that originated in Asia Minor, Egypt, Syria and Persia, and we shall endeavor to {11} distinguish their individual characteristics and estimate their value. We shall see, finally, how the ancient idolatry was transformed and what form it assumed in its last struggle against Christianity, whose victory was furthered by Asiatic mysteries, although they opposed its doctrine. * * * * * But before broaching this subject a preliminary question must be answered. Is the study which we have just outlined possible? What items will be of assistance to us in this undertaking? From what sources are we to derive our knowledge of the Oriental religions in the Roman empire? It must be admitted that the sources are inadequate and have not as yet been sufficiently investigated. Perhaps no loss caused by the general wreck of ancient literature has been more disastrous than that of the liturgic books of paganism. A few mystic formulas quoted incidentally by pagan or Christian authors and a few fragments of hymns in honor of the gods[14] are practically all that escaped destruction. In order to obtain an idea of what those lost rituals may have been one must turn to their imitations contained in the chorus of tragedies, and to the parodies comic authors sometimes made; or look up in books of magic the plagiarisms that writers of incantations may have committed.[15] But all this gives us only a dim reflection of the religious ceremonies. Shut out from the sanctuary like profane outsiders, we hear only the indistinct echo of the sacred songs and not even in imagination can we attend the celebration of the mysteries.