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Others postulate a transmutation for bodies and souls alike; in the same manner in which water is seen to be generated from earth, air from water, and fine from air, as their substance is borne upward, even so from men into heroes and from heroes into demigods the better souls obtain their transmutation. But from the demigods a few souls still, in the long reach of time, because of supreme excellence, come, after being purified, to share completely in divine qualities. But with some of these souls it comes to pass that they do not maintain control over themselves, but yield to temptation and are again clothed with mortal bodies and have a dim and darkened life, like mist or vapour.