The same contrast is apparent in a comparison of the two religions with reference to the conception of the hereafter. The picture of eternity seen by the faith of the Christian is that of a paradise freed from all earthly sensuality, promising the purest of intellectual happiness; the fancy of the Mussulman fills the future life with the delights of a harem full of houris. In spite of all the aids which religion, law, education, and morality give civilized man in the bridling of his passions, he is always in danger of sinking from the clear height of pure, chaste love into the mire of common sensuality. In order to maintain one’s self on such a height, a constant struggle between natural impulses and morals, between sensuality and morality, is required. Only characters endowed with strong wills are able to completely emancipate themselves from sensuality and share in that pure love from which spring the noblest joys of human life. It is yet questionable whether, in the course of the later centuries, mankind has advanced in morality. It is certain, however, that the race has become more modest; and this phenomenon of civilization—this hiding of the animal propensities—is, at least, a concession that vice makes to virtue. From a reading of Scherr’s works (“History of German Civilization”) one would certainly gain the impression that, in comparison with those of the Middle Ages, our own ideas of morals have become refined, even when it must also be allowed that in many instances finer manners, without greater morality, have taken the place of earlier obscenity and coarseness of expression. When widely separated periods of history are compared, no doubt is left that public morality, in spite of occasional temporary retrogression, makes continuous progress, and that Christianity is one of the most powerful of the forces favoring moral progress. To-day we are far beyond the sexual conditions which, as shown in the sodomitic worship of the gods, in the life of the people, and in the laws and religious practices, existed among the ancient Greeks,—to say nothing of the worship of Phallus and Priapus among the Athenians and Babylonians, of the bacchanals of ancient Rome, and the prominent place prostitutes took among these peoples. In the slow and often imperceptible progress which human morality makes there are variations or fluctuations, just as in the individual sexuality manifests an ebb and flow.