Since however, theologists assert that an exemption from old age pertains to this order, as the Barbarians say, and Orpheus the theologist of the Greeks, (for he mystically says that the hairs of the face of Saturn are always black, and never become hoary) I admire the divinely-inspired intellect of Plato which unfolds the same things concerning this God to those who proceed in his steps. For he says that souls in the Saturnian period abandon old age, but return to youth, and remove from themselves hoariness, but have black hair. For he says that the white hairs of the more elderly become black; but the cheeks of those that have beards being rendered smooth, they are restored to the past season [of youth.] These things indeed are asserted by the Elean guest; similar to which are the assertions of Orpheus concerning this God.
In these verses he delivers the similitude of Saturnian souls to this God. For he says that they remove from the view the old age which they had acquired from generation and abandon material imbecility; and that they exert the juvenile and vigorous life of intellect. For it is no otherwise lawful for them to be assimilated to the God who is exempt from old age, than through intellectual puberty, and undefiled power. But the cause of this is, that king Saturn himself is the source of the unallured Gods, and the inflexible triad. Hence he is, as Socrates says, a pure intellect. For he is at the same time the intellect of the undefiled order, ranking as a summit, and riding as in a vehicle in the flourishing and vigorous[260] Gods that govern wholes. The souls also which are sent to him, wonderfully advance, in conjunction with intellectual energy, in vigour, and in a power undeviating, and free from any tendency to matter. Partial souls therefore, when they change their periods, at one time proceed to a more juvenile, and at another, to a more aged condition. But whole souls always live according to both these periods, and are conversant with Saturn according to the unapparent period, but govern the universe in conjunction with Jupiter, according to visible providence, at once receiving an increase according to both these periods, and becoming at one and the same time both older and younger. And this is what Parmenides indicates when he says, that the one proceeding according to time becomes at once younger and older. These things however, will hereafter be more manifest.