5 In Timotheus, who was no mean mythologist, and also in others equally well informed, the birth of the Great Mother of the gods, and the origin of her rites, are thus detailed, being de-rived— as he himself writes and suggests— from learned books of antiquities, and from his acquaintance with the most secret mysteries:— Within the confines of Phrygia, he says, there is a rock of unheard-of wildness in every respect, the name of which is Agdus, so named by the natives of that district.
Stones taken from it, as Themis by her oracle had enjoined, Deucalion and Pyrrha threw upon the earth, at that time emptied of men; from which this Great Mother, too, as she is called, was fashioned along with the others, and animated by the deity. Her, given over to rest and sleep on the very summit of the rock, Jupiter assailed with lewdest desires. But when, after long strife, he could no accomplish what he had proposed to himself, he, baffled, spent his lust on the stone.
This the rock received, and with many groanings Acdestis is born in the tenth month, being named from his mother rock. In him there had been resistless might, and a fierceness of disposition beyond control, a lust made furious, and derived from both sexes. He violently plundered and laid waste; he scattered destruction wherever the ferocity of his disposition had led him; he regarded not gods nor men, nor did he think anything more powerful than himself; he contemned earth, heaven, and the stars.
Source: Against the Heathen (New Advent)