In the next place let us direct our attention to the Parmenides of Plato, and see how in that most theological dialogue the mundane Gods are characterized. In the first hypothesis therefore of that dialogue, in which all the divine orders are denied of the one, Parmenides characterizes the mundane Gods by the equal and the unequal as follows: “But since the one is such, it will neither be equal nor unequal either to itself or to another. How so? If it were equal, indeed, it would be of the same measures with that to which it is equal. Certainly. But that which is greater or less than the things with which it is commensurate, will possess more measures than the less quantities, but fewer than the greater. Certainly. But to those to which it is incommensurable, with respect to the one part, it will consist of less; and with respect to the other of greater measures. How should it not? Is it not therefore impossible that a thing which does not participate of same should either be of the same measures, or admit any thing in any respect the same? It is impossible. It will therefore neither be equal to itself nor to another, if it does not consist of the same measures. It does not appear that it will. But if it consists of more or fewer measures, it will be of as many parts as there are measures; and so again, it will no longer be the one, but as many as there are measures. Right. But if it should be of one measure, it would become equal to that measure. It has, however, appeared that the one cannot be equal to any thing. It has appeared so. The one, therefore, neither participates of one measure, nor of many, nor of a few; nor (since it in no respect participates of same) can it ever, as it appears, be equal to itself or to another, nor again greater or less either than itself or another. It is in every respect so.”
As the commentary of Proclus on the second hypothesis of the Parmenides, in which the equal and the unequal are affirmed of the one, is lost, and in which I have no doubt, the properties of the mundane Gods were most fully unfolded, I shall present the reader with the following extract from his commentary on the above passage in the Parmenides of Plato. The peculiarity of the mundane Gods is the equal and the unequal, the former of these indicating their fulness, and their receiving neither any addition nor ablation; (for such is that which is equal to itself, always preserving the same boundary;) but the latter, the multitude of their powers, and the excess and defect which they contain. For in these, divisions, variety of powers, differences of progressions, analogies, and bonds through these, are, according to ancient theologists, especially allotted a place. Hence, Timæus also constitutes souls through analogy, the causes of which must necessarily presubsist in the Gods that proximately preside over souls. And as all analogies subsist from equality, Plato very properly indicates the peculiarity of these divinities by the equal and the unequal. But he now rightly frames the demonstrations of the negations of the equal and the unequal from sameness and the many, and not from the similar and the dissimilar, though immediately before he spoke of these. For every mundane deity proceeds from the demiurgic monad, and the first multitude which he denies of the one.
Of this then we must be entirely persuaded, that the things of which demonstrations consist are the preceding causes of the particulars about which Parmenides discourses; so that the equal and the unequal, so far as they proceed from the one, and subsist through sameness and the many, so far through these they are denied of the one. Hence, Plato thus begins his discussion of them:--“But since it (viz. the one) is such,” i.e. not as we have just now demonstrated, but as was formerly shown, that it neither receives same nor different, and is without multitude,--being such, it is neither equal nor unequal, neither to itself, nor to others. For again, there are here twofold conclusions, in the same manner as concerning the similar and the dissimilar, and the same and the different. But that the equal and the unequal are suspended from the twofold co-ordinations of divine natures is not immanifest. For the equal is arranged under the similar, and the same, subsistence in another, the round, and the whole; but the unequal, under the dissimilar, the different, subsistence in itself, the straight, and the possession of parts. And again, of these the former are suspended from bound, but the latter from infinity. Plato also appears to produce the discourse through certain oppositions, as it were, that he may show that the one is above all opposition. For the one cannot be the worse of the two opposites, since this would be absurd; nor can it be the better of the two, since in this case it would not be the cause of all things. For the better opposite is not the cause of the worse, but in a certain respect communicates with it, without being properly its cause. For neither does sameness give subsistence to difference, nor permanency to motion; but comprehension and union pervade from the better to the worse.
It is, however, by no means wonderful that the demonstrations of the equal and the unequal, which are here assumed as symbols of mundane deity, should be adapted to physical and mathematical equals, to the equals in the reasons of soul, and to those in intellectual forms. For it is necessary that demonstrations in all these negations should begin supernally, and should extend through all secondary natures, that they may show that the one of the Gods is exempt from intellectual, psychical, mathematical, and physical forms. All such axioms, therefore, as are now assumed concerning things equal and unequal, must be adapted to this order of Gods. Hence, as it contains many powers, some of which are co-ordinate with each other, and extend themselves to the self-perfect and the good, but others differ according to transcendency and subjection--the former must be said to be characterized by equality, but the latter by inequality. For the good is the measure of every thing: and hence such things as are united by the same good are measured by the same measure, and are equal to each other. But things which are unco-ordinated with each other make their progression according to the unequal.
Since, however, of things unequal, some are commensurate and others incommensurate, it is evident that these also must be adapted to divine natures. Hence commensuration must be referred to those Gods, through whom secondary natures are mingled with those prior to them, and participate of the whole of more excellent beings. For thus, in things commensurate, the less is willing to have a common measure with the greater, the same thing measuring the whole of each. But incommensuration must be ascribed to those divinities from whom things subordinate, through the exempt transcendency of more excellent natures, participate of them in a certain respect, but are incapable through their subjection of being conjoined with the whole of them. For the communion proceeding from first to partial and multifarious natures is incommensurate to the latter. If, indeed, the equal and the unequal are symbols of the mundane Gods, the commensurate and the incommensurate are here very properly introduced. For in things incorporeal and immaterial this opposition has no place, all things being there effable; but where there is a material subject, and a mixture of form and something formless, there an opposition of commensuration very properly subsists. Hence, as the mundane Gods are proximately connective of souls and bodies, form and matter, a division appears in them, according to the equal and the unequal.
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.