Man and His Symbols

“Perhaps the commonest dream symbol of transcendence is the snake, as represented by the therapeutic symbol of the Roman god of medicine Aesclepius, which has survived to modern times as a sign of the medical profession. This was originally a nonpoisonous tree snake; as we see it, coiled around the staff of the healing god, it seems to embody a kind of mediation between earth and heaven.” `Carl Jung, Man and his Symbols, page 153