Certain it is that for a long time the celebration of the Eleusinian ceremonies was confined to these two neighbouring states, until, as various causes contributed to unite the whole of Greece in a common religion and a common name, admission was granted all Greeks of all ranks, male and female,--provided they had committed no inexpiable offence, performed the previous ceremonies required, and were introduced by an Athenian citizen.
With the growing flame and splendour of Athens, this institution rose into celebrity and magnificence, until it appears to have become the most impressive spectacle of the heathen world. It is evident that a people so imitative would reject no innovations or additions that could increase the interest or the solemnity of exhibition; and still less such as might come (through whatsoever channel) from that antique and imposing Egypt, which excited so much of their veneration and wonder. Nor do I think it possible to account for the great similarity attested by Herodotus and others, between the mysteries of Isis and those of Ceres, as well as for the resemblance in less celebrated ceremonies between the rites of Egypt and of Greece, without granting at once, that mediately, or even immediately, the superstitious of the former exercised great influence upon, and imparted many features to, those of the latter. But the age in which this religious communication principally commenced has been a matter of graver dispute than the question merits. A few solitary and scattered travellers and strangers may probably have given rise to it at a very remote period; but, upon the whole, it appears to me that, with certain modifications, we must agree with Lobeck, and the more rational schools of inquiry, that it was principally in the interval between the Homeric age and the Persian war that mysticism passed into religion--that superstition assumed the attributes of a science--and that lustrations, auguries, orgies, obtained method and system from the exuberant genius of poetical fanaticism.
That in these august mysteries, doctrines contrary to the popular religion were propounded, is a theory that has, I think, been thoroughly overturned. The exhibition of ancient statues, relics, and symbols, concealed from daily adoration (as in the Catholic festivals of this day), probably, made a main duty of the Hierophant. But in a ceremony in honour of Ceres, the blessings of agriculture, and its connexion with civilization, were also very naturally dramatized. The visit of the goddess to the Infernal Regions might form an imposing part of the spectacle: spectral images--alternations of light and darkness--all the apparitions and effects that are said to have imparted so much awe to the mysteries, may well have harmonized with, not contravened, the popular belief. And there is no reason to suppose that the explanations given by the priests did more than account for mythological stories, agreeably to the spirit and form of the received mythology, or deduce moral maxims from the representation, as hackneyed, as simple, and as ancient, as the generality of moral aphorisms are. But, as the intellectual progress of the audience advanced, philosophers, skeptical of the popular religion, delighted to draw from such imposing representations a thousand theories and morals utterly unknown to the vulgar; and the fancies and refinements of later schoolmen have thus been mistaken for the notions of an early age and a promiscuous multitude. The single fact (so often insisted upon), that all Greeks were admissible, is sufficient alone to prove that no secrets incompatible with the common faith, or very important in themselves, could either have been propounded by the priests or received by the audience. And it may be further observed, in corroboration of so self-evident a truth, that it was held an impiety to the popular faith to reject the initiation of the mysteries--and that some of the very writers, most superstitious with respect to the one, attach the most solemnity to the ceremonies of the other.