The philosophical criticism of the Greeks had early attacked these traditional beliefs, but such negative attitude became more definite among the thinkers of the surpassingly rationalistic period which came after Aristotle.[184] The Peripatetics, who admitted at most the survival of reason, rejected in consequence all the myths dealing with the descent of the shades into the kingdom of Pluto. The Epicureans were even more radical, for, as we have seen (p. 7), they condemned the soul to dissolution at the moment of death, thus destroying the very foundation of the belief in Hades. Their campaign against stories in which they saw only the lugubrious inventions of priests and poets, was one of the capital points of their polemics against popular religion, and they flattered themselves that by destroying faith in the pains of Tartarus they freed mankind from vain terrors which obsessed its minds and poisoned its joys. The Stoics, we know (p. 13), taught that the soul is a burning breath of the same nature as the ether and as the stars which shine in the sky. As to whether this ardent fluid was lost after death in the universal fire, or kept its individuality until the final conflagration of the world, the doctrine of the Porch varied. But one thing was certain: the fiery nature of the soul must prevent it from going down into the underground and impel it to rise to higher spheres. If it were weighed down by its contact with the body and laden with matter, it might float for some time in the dense air surrounding the earth but could never descend into its depths.[185] The impossibility of admitting literally the truth of the stories as to the infernal realm was thus proved. The same psychological doctrine as to the soul’s kinship with the fire of the heavenly bodies was admitted in the Alexandrian age by the sect which paid one and the same veneration to Pythagoras and to Plato and was thus more attached than any other to belief in immortality. It gave in, to some extent, to contemporary rationalism and was brought to modify its ideas as to life beyond the grave. Ancient Pythagorism, the heir of Orphism, made much of the sufferings reserved for sinners in the infernal abysses. A book attributed to Periktione still shows the daughter who has despised her parents as condemned to suffer, beneath the earth and in the company of the impious, the eternal evil inflicted by “Dike and the gods of down below.”[186] But in the first century before our era the pseudo-Timaeus of Locri declares that such tales are fictions—salutary, it is true—imagined by Homer in order to divert from evil those to whom truth alone was not a sufficient guide.[187] The only penalty which can overtake the sinning soul is, according to these Neo-Pythagoreans, metempsychosis, which forces it to reincarnate itself in a fleshly prison.[188]