The policy of the emperors and the senate, as far as it concerned religion, was happily seconded by the reflections of the enlightened, and by the habits of the superstitious, part of their subjects. The various modes of worship which prevailed in the Roman world were all considered by the people as equally true; by the philosopher as equally false; and by the magistrate as equally useful. And thus toleration produced not only mutual indulgence, but even religious concord.

The superstition of the people was not embittered by any mixture of theological rancour; nor was it confined by the chains of any speculative system. The devout polytheist, though fondly attached to his national rites, admitted with implicit faith the different religions of the earth. Fear, gratitude, and curiosity, a dream or an omen, a singular disorder, or a distant journey, perpetually disposed him to multiply the articles of his belief, and to enlarge the list of his protectors. The thin texture of the pagan mythology was interwoven with various but not discordant materials. As soon as it was allowed that sages and heroes, who had lived or who had died for the benefit of their country, were exalted to a state of power and immortality, it was universally confessed that they deserved, if not the adoration, at least the reverence of all mankind. The deities of a thousand groves and a thousand streams possessed in peace their local and respective influence; nor could the Roman who deprecated the wrath of the Tiber deride the Egyptian who presented his offering to the beneficent genius of the Nile. The visible powers of Nature, the planets, and the elements, were the same throughout the universe. The invisible governors of the moral world were inevitably cast in a similar mould of fiction and allegory. Every virtue, and even vice, acquired its divine representative; every art and profession its patron, whose attributes in the most distant ages and countries were uniformly derived from the character of their peculiar votaries. A republic of gods of such opposite tempers and interests required, in every system, the moderating hand of a supreme magistrate, who, by the progress of knowledge and of flattery, was gradually invested with the sublime perfections of an Eternal Parent and an Omnipotent Monarch. Such was the mild spirit of antiquity, that the nations were less attentive to the difference than to the resemblance of their religious worship. The Greek, the Roman, and the Barbarian, as they met before their respective altars, easily persuaded themselves that, under various names and with various ceremonies, they adored the same deities. The elegant mythology of Homer gave a beautiful and almost a regular form to the polytheism of the ancient world…

…It is not easy to conceive from what motives a spirit of persecution could introduce itself into the Roman councils. The magistrates could not be actuated by a blind though honest bigotry, since the magistrates were themselves philosophers; and the schools of Athens had given laws to the senate. They could not be impelled by ambition or avarice, as the temporal and ecclesiastical powers were united in the same hands. The pontiffs were chosen among the most illustrious of the senators; and the office of Supreme Pontiff was constantly exercised by the emperors themselves. They knew and valued the advantages of religion, as it is connected with civil government. They encouraged the public festivals which humanize the manners of the people. They managed the arts of divination as a convenient instrument of policy; and they respected, as the firmest bond of society, the useful persuasion that, either in this or in a future life, the crime of perjury is most assuredly punished by the avenging gods. But, whilst they acknowledged the general advantages of religion, they were convinced that the various modes of worship contributed alike to the same salutary purposes; and that, in every country, the form of superstition which had received the sanction of time and experience was the best adapted to the climate and to its inhabitants. Avarice and taste very frequently despoiled the vanquished nations of the elegant statues of their gods and the rich ornaments of their temples; but, in the exercise of the religion which they derived from their ancestors, they uniformly experienced the indulgence, and even protection, of the Roman conquerors.