1 Admitting that all these things which do the immortal gods dishonour, have been put forth by poets merely in sport, what of those found in grave, serious, and careful histories, and handed down by you in hidden mysteries? Have they been invented by the licentious fancy of the poets? Now if they seemed to you stories of such absurdity, some of them you would neither retain in their constant use, nor celebrate as solemn festivals from year to year, nor would you maintain them among your sacred rites as shadows of real events. With strict moderation, I shall adduce only one of these stories which are so numerous; that in which Jupiter himself is brought on the stage as stupid and inconsiderate, being tricked by the ambiguity of words. In the second hook of Antias— lest any one should think, perchance, that we are fabricating charges calumniously — the following story is written:—
The famous king Numa, not knowing how to avert evil portended by thunder, and being eager to learn, by advice of Egeria concealed beside a fountain twelve chaste youths provided with chains; so that when Faunus and Martius Picus came to this place to drink—for hither they were wont to come to draw water—they might rush on them, seize and bind them. But, that this might be done more speedily, the king filled many cups with wine and with mead, and placed them about the approaches to the fountain, where they would be seen— a crafty snare for those who should come. They, as was their usual custom, when overcome by thirst, came to their well-known haunts. But when they had perceived cups with sweetly smelling liquors, they preferred the new to the old; rushed eagerly upon them; charmed with the sweetness of the draught, drank too much; and becoming drunk, fell fast asleep. Then the twelve youths threw themselves upon the sleepers, and cast chains round them, lying soaked with wine; and they, when roused, immediately taught the king by what methods and sacrifices Jupiter could be called down to earth. With this knowledge the king performed the sacred ceremony on the Aventine, drew down Jupiter to the earth, and asked from him the due Form of expiation. Jupiter having long hesitated, said, “You shall avert what is portended by thunder with a head.” The king answered. “With an onion.” Jupiter again, “With a man's.” The king returned, “But with hair.” The deity in turn, “With the life. With a fish,” rejoined Pompilius. Then Jupiter, being ensnared by the ambiguous terms used, uttered these words: “You have overreached me, Numa; for I had determined that evils portended by thunder should be averted with sacrifices of human heads, not with hair and an onion. Since, however, your craft has outwitted me, have the mode which you wished; and always undertake the expiation of thunder-portents with those things which you have bargained for.”
Source: Against the Heathen (New Advent)