The vitalization of the evidence regarding these cults is M. Cumont's great contribution. His perseverance in the accurate collection of material is equalled only by his power to see the real nature and effect of the religions of which he writes. Assuming that no religion can succeed merely because of externals, but must stand on some foundation of moral excellence, he shows how the pagan faiths were able to hold their own, and even to contest the ground with Christianity. These religions, he asserts, gave greater satisfaction first, to the senses and passions, secondly, to the intelligence, finally, and above all, to the conscience. "The spread of the Oriental religions"--again I quote { xi} a summary from _Classical Philology_--"was due to merit. In contrast to the cold and formal religions of Rome, the Oriental faiths, with their hoary traditions and basis of science and culture, their fine ceremonial, the excitement attendant on their mysteries, their deities with hearts of compassion, their cultivation of the social bond, their appeal to conscience and their promises of purification and reward in a future life, were personal rather than civic, and satisfied the individual soul.... With such a conception of latter-day paganism, we may more easily understand its strength and the bitter rivalry between it and the new faith, as well as the facility with which pagan society, once its cause was proved hopeless, turned to Christianity." The Oriental religions had made straight the way. Christianity triumphed after long conflict because its antagonists also were not without weapons from the armory of God. Both parties to the struggle had their loins girt about with truth, and both wielded the sword of the spirit; but the steel of the Christian was the more piercing, the breastplate of his righteousness was the stronger, and his feet were better shod with the preparation of the gospel of peace.
Nor did Christianity stop there. It took from its opponents their own weapons, and used them; the better elements of paganism were transferred to the new religion. "As the religious history of the empire is studied more closely," writes M. Cumont, "the triumph of the church will, in our opinion, appear more and more as the culmination of a long evolution of beliefs. We can understand the Christianity of the fifth century with its greatness and weaknesses, its spiritual exaltation and its puerile superstitions, if we { xii} know the moral antecedents of the world in which it developed."