Isis herself is said to have established the first temple of the Mysteries, the oldest being those practiced at Memphis. Of these there were two orders, the Lesser to which the many were eligible, and which consisted of dialogue and ritual, with certain signs, tokens, grips, passwords; and the Greater, reserved for the few who approved themselves worthy of being entrusted with the highest secrets of science, philosophy, and religion. For these the candidate had to undergo trial, purification, danger, austere asceticism, and, at last, regeneration through dramatic death amid rejoicing. Such as endured the ordeal with valor were then taught, orally and by symbol, the highest wisdom to which man had attained, including geometry, astronomy, the fine arts, the laws of nature, as well as the truths of faith. Awful oaths of secrecy were exacted, and Plutarch describes a man kneeling, his hands bound, a cord round his body, and a knife at his throat--death being the penalty of violating the obligation. Even then, Pythagoras had to wait almost twenty years to learn the hidden wisdom of Egypt, so cautious were they of candidates, especially of foreigners. But he made noble use of it when, later, he founded a secret order of his own at Crotona, in Greece, in which, among other things, he taught geometry, using numbers as symbols of spiritual truth.[43] From Egypt the Mysteries passed with little change to Asia Minor, Greece, and Rome, the names of local gods being substituted for those of Osiris and Isis. The Grecian or Eleusinian Mysteries, established 1800 B.C., represented Demeter and Persephone, and depicted the death of Dionysius with stately ritual which led the neophyte from death into life and immortality. They taught the unity of God, the immutable necessity of morality, and a life after death, investing initiates with signs and passwords by which they could know each other in the dark as well as in the light. The Mithraic or Persian Mysteries celebrated the eclipse of the Sun-god, using the signs of the zodiac, the processions of the seasons, the death of nature, and the birth of spring. The Adoniac or Syrian cults were similar, Adonis being killed, but revived to point to life through death. In the Cabirie Mysteries on the island of Samothrace, Atys the Sun was killed by his brothers the Seasons, and at the vernal equinox was restored to life. So, also, the Druids, as far north as England, taught of one God the tragedy of winter and summer, and conducted the initiate through the valley of death to life everlasting.[44]