It now remains that we should begin to speak about these three fathers, following the mystic narrations of Plato, since all of them are suspended from the demiurgic monad, and present themselves to our view as the second [in rank] after it. These three leaders, therefore, of wholes, and rulers, are emitted indeed from the intellectual fathers, and are divided according to them; but they are unfolded into light in all the partible orders of the Gods. For among the rulers they are allotted the first order, and are analogous to the intelligible and intellectual fathers, in the whole assimilative series, and having made a second progression in the liberated Gods, they rule over the universe. Together also with the mundane Gods, they give completion to the apparent order of things, being allotted in one way an essence in the heavens, but in another way distributing the total parts in the sublunary region, but every where energizing paternally and demiurgically, expanding the one fabrication, and adapting it to parts.
With respect, however, to the allotment and distribution of them, in the first place, if you please, it is according to the whole universe, the first of them producing essences, the second lives and generations, and the third administering formal divisions. And the first indeed establishing in the one demiurgus all things that thence proceed; but the second calling all things into progression; and the third converting all things to itself. In the second place, the allotment and division of them are according to the parts of the universe. For the first of them adorns the inerratic sphere, and the circulation of it; but the second governs the planetary region, and perfects the multiform, efficacious, and prolific motions in it; and the last administers the sublunary region, and intellectually perfects the terrestrial world. Again, in the third place, we may survey in that which is generated, these three demiurgic progressions; since Timæus also here makes mention of the offspring of Saturn. Jupiter, therefore, administers the summit of generated natures, and governs the spheres of fire and air. But Neptune all-variously moves the middle and very-mutable elements, and is the inspective guardian of every moist essence, which is beheld in air and water. And Pluto providentially attends to the earth, and to every thing in the earth. Hence also he is called terrestrial Jupiter.
In the fourth place, therefore, in the whole of generation, Jupiter indeed is allotted the summits, and the parts which are raised above others, in which also are the allotments of happy souls, as Socrates says in the Phædrus, because they then live under Jupiter, beyond generation. But Neptune is allotted cavities, and cavernous places, with which generation, motion, and the incursion of concussions are conversant. Hence, they call this God, the earth-shaker. And Pluto is allotted the places under the earth, various streams, Tartarus itself, and in short, the places in which souls are judged and punished. Whence also, of souls themselves, they say that such of them as have not yet proceeded into generation, but abide in the intelligible, are Jovian; but that such as are conversant with generation, are arranged under Neptune; and that such as are purified and punished after generation, and wander under the earth, according to a journey of a thousand years, or which are again converted and led back to their principle, are perfected under Pluto.
In the fifth place, therefore, we must say that the allotments of these divinities, are divided according to the centres of the universe. And Jupiter, indeed, has the eastern centre, as being allotted an order analogous to fire; but Neptune, the middle centre, which pertains to vivification, and according to which especially generation enjoys celestial natures; and Pluto the western centre, since we say that the west is co-ordinate to earth, as being nocturnal, and the cause of the unapparent. For shadow is from earth, and earth is the privation of light from west to east. In short, according to every division of the world, we admit that the first and most leading parts are Jovian; but we say that the middle parts pertain to the kingdom of Neptune; and we consider the last parts as belonging to the empire of Pluto.
The Six Books of Proclus, the Platonic Successor, on the Theology of Plato (vol. 2 of 2) · The Wunder Library — complete classics, free to read, with narration.