Nor is it strange that the Roman Empire at this period exhibited such a scene of moral pollution. There was nothing in either the philosophy or the religion of heathenism sufficient to counteract the influence of man's native depravity. In many instances the speculations of the pagan sages had a tendency, rather to weaken, than to sustain, the authority of conscience. After unsettling the foundations of the ancient superstition, the mind was left in doubt and bewilderment; for the votaries of what was called wisdom entertained widely different views even of its elementary principles. The Epicureans, who formed a large section of the intellectual aristocracy, denied the doctrine of Providence, and pronounced pleasure to be the ultimate end of man. The Academics encouraged a spirit of disputatious scepticism; and the Stoics, who taught that the practice of, what they rather vaguely designated, virtue, involves its own reward, discarded the idea of a future retribution. Plato had still a goodly number of disciples; and though his doctrines, containing not a few elements of sublimity and beauty, exercised a better influence, it must be admitted, after all, that they constituted a most unsatisfactory system of cold and barren mysticism. The ancient philosophers delivered many excellent moral precepts; but, as they wanted the light of revelation, their arguments in support of duty were essentially defective, and the lessons which they taught had often very little influence either on themselves or others. [8:1] Their own conduct seldom marked them out as greatly superior to those around them, so that neither their instructions nor their example contributed efficiently to elevate the character of their generation. Though the philosophers fostered a spirit of inquiry, yet, as they made little progress in the discovery of truth, they were not qualified to act with the skill and energy of enlightened reformers; and, whatever may have been the amount of their convictions, they made no open and resolute attack on the popular mythology. A very superficial examination was, indeed, enough to shake the credit of the heathen worship. The reflecting subjects of the Roman Empire might have remarked the very awkward contrast between the multiplicity of their deities, and the unity of their political government. It was the common belief that every nation had its own divine guardians, and that the religious rites of one country might be fully acknowledged without impugning the claims of those of another; but still a thinking pagan might have been staggered by the consideration that a human being had apparently more extensive authority than some of his celestial overseers, and that the jurisdiction of the Roman emperor was established over a more ample territory than that which was assigned to many of the immortal gods.