Some souls were kept on the banks of the Styx and could not cross it: in other words, they were constrained to remain on the earth. The dead who had not had religious burial must linger beside their neglected bodies for a hundred years, the normal span of a human life, before they were admitted to the place of purgation, where they would sojourn for ten times that period.[71] In the same way those who had died young or whose days had been cut short by violence would not enter the purgatory before the due term of their life.[72] But especially the souls of the criminal and the impious were thus condemned to wander, restless and in pain, through the lower air, which they filled with their multitude. It was these demoniac spirits who returned as dismal phantoms to frighten the living, who were evoked by wizards and who revealed the future in oracles. Demonology accounted for all the aberrations of magic and divination. These spirits rose to the aerial purgatory after they had for long years tormented and been tormented, but they could not reach the moon, which repelled them; they were condemned to reincarnation in new bodies, either of men or of beasts, and were once again delivered to the fury of the passions. These passions are the Erinyes, of whom poets sung, that in Tartarus they burnt criminals with their torches and scourged them with their whips. For there was no subterranean hell: Hades was in the air or on our earth, and the infernal sufferings described by mythology were the various tortures inflicted on the souls condemned to transmigration.[73]