"But if it be necessary to consider, in one Platonic dialogue, the all-perfect, whole and connected, extending as far as to the complete number of theology, I shall perhaps assert a paradox, and which will alone be apparent to our familiars. We ought however to dare, since we have begun the assertion, and affirm against our opponents, that the Parmenides, and the mystic conceptions of this dialogue, will accomplish all you desire. For in this dialogue, all the divine genera proceed in order from the first cause, and evince their mutual suspension from each other. And those indeed which are highest, connate with the one, and of a primary nature, are allotted a form of subsistence, characterized by unity, occult and simple; but such as are last are multiplied, are distributed into many parts, and excel in number, but are inferior in power to such as are of a higher order; and such as are middle, according to a convenient proportion, are more composite than their causes, but more simple than their proper progeny. And, in short, all the axioms of the theological science appear in perfection in this dialogue; and all the divine orders are exhibited subsisting in connection. So that this is nothing else than the celebrated generation of the gods, and the procession of every kind of being from the ineffable and unknown cause of wholes.[10] The Parmenides therefore, enkindles in the lovers of Plato the whole and perfect light of the theological science. But after this, the aforementioned dialogues distribute parts of the mystic discipline about the gods, and all of them, as I may say, participate of divine wisdom, and excite our spontaneous conceptions respecting a divine nature.
————————— [10] The principle of all things is celebrated by Platonic philosophy as the cause of wholes, because through transcendency of power he first produces those powers in the universe which rank as wholes, and afterward those which rank as parts through these. Agreeably to this Jupiter, the artificer of the universe, is almost always called [Greek: demiourgos ton olon], the demiurgus of wholes. See the Timaeus, and the Introduction to it. —————————
And it is necessary to refer all the parts of this mystic discipline to these dialogues, and these again to the one and all perfect theory of the Parmenides. For thus, as it appears to me, we shall suspend the more imperfect from the perfect, and parts from wholes, and shall exhibit reasons assimilated to things of which, according to the Platonic Timaeus, they are interpreters. Such then is our answer to the objection which may be urged against us; and thus we refer the Platonic theory to the Parmenides; just as the Timaeus is acknowledged by all who have the least degree of intelligence to contain the whole science about nature."
All that is here asserted by Proclus will be immediately admitted by the reader who understands the outlines which we have here given of the theology of Plato, and who is besides this a complete master of the mystic meaning of the Parmenides; which I trust he will find sufficiently unfolded, through the assistance of Proclus, in the introduction and notes to that dialogue.
The next important Platonic dogma in order, is that doctrine concerning ideas, about which the reader will find so much said in the notes on the Parmenides, that but little remains to be added here. That little however is as follows: The divine Pythagoras, and all those who have legitimately received his doctrines, among whom Plato holds the most distinguished rank, asserted that there are many orders of beings, viz. intelligible, intellectual, dianoetic, physical, or in short, vital and corporeal essences. For the progression of things, the subjection which naturally subsists together with such progression, and the power of diversity in coordinate genera give subsistence to all the multitude of corporeal and incorporeal natures. They said, therefore, that there are three orders in the whole extent of beings; viz. the intelligible, the dianoetic, and the sensible; and that in each of these ideas subsist, characterized by the respective essential properties of the natures by which they are contained. And with respect to intelligible ideas, these they placed among divine natures, together with the producing, paradigmatic, and final causes of things in a consequent order. For if these three causes sometimes concur, and are united among themselves, (which Aristotle says is the case), without doubt this will not happen in the lowest works of nature, but in the first and most excellent causes of all things, which on account of their exuberant fecundity have a power generative of all things, and from their converting and rendering similar to themselves the natures which they have generated, are the paradigms, or exemplars of all things. But as these divine causes act for their own sake, and on account of their own goodness, do they not exhibit the final cause? Since therefore intelligible forms are of this kind, and are the leaders of so much good to wholes, they give completion to the divine orders, though they largely subsist about the intelligible order contained in the artificer of the universe. But dianoetic forms or ideas imitate the intellectual, which have a prior subsistence, render the order of soul similar to the intellectual order, and comprehend all things in a secondary degree.
These forms beheld in divine natures possess a fabricative power, but with us they are only gnostic, and no longer demiurgic, through the defluxion of our wings, or degradation of our intellectual powers. For, as Plato says in the Phaedrus, when the winged powers of the soul are perfect and plumed for flight, she dwells on high, and in conjunction with divine natures governs the world. In the Timaeus, he manifestly asserts that the demiurgus implanted these dianoetic forms in souls, in geometric, arithmetic, and harmonic proportions: but in his Republic (in the section of a line in the 6th book) he calls them images of intelligibles; and on this account does not for the most part disdain to denominate them intellectual, as being the exemplars of sensible natures. In the Phaedo he says that these are the causes to us of reminiscence; because disciplines are nothing else than reminiscences of middle dianoetic forms, from which the productive powers of nature being derived and inspired, give birth to all the mundane phenomena.
Plato however did not consider things definable, or in modern language abstract ideas, as the only universals, but prior to these he established those principles productive of science which essentially reside in the soul, as is evident from his Phaedrus and Phaedo. In the 10th book of the Republic too, he venerates those separate forms which subsist in a divine intellect. In the Phaedrus, he asserts that souls elevated to the supercelestial place, behold Justice herself, temperance herself, and science herself; and lastly in the Phaedo he evinces the immortality of the soul from the hypothesis of separate forms.
Syrianus[11], in his commentary on the 13th book of Aristotle's Metaphysics, shows in defense of Socrates, Plato, the Parmenideans, and Pythagoreans, that ideas were not introduced by these divine men according to the usual meaning of names, as was the opinion of Chrysippus, Archedemus, and many of the junior Stoics; for ideas are distinguished by many differences from things which are denominated from custom. Nor do they subsist, says he, together with intellect, in the same manner as those slender conceptions which are denominated universals abstracted from sensibles, according to the hypothesis of Longinus:[12] for if that which subsists is unsubstantial, it cannot be consubsistent with intellect.
————————- [11] See my translation of Aristotle's Metaphysics, p. 347. If the reader conjoins what is said concerning ideas in the notes on that work, with the introduction and notes to the Parmenides in this, he will be in possession of nearly all that is to be found in the writings of the ancients on this subject.
[12] It appears from this passage of Syrianus that Longinus was the original inventor of the theory of abstract ideas; and that Mr. Locke was merely the restorer of it. ————————-