Circumstances and persons of the Parmenides.
Passing over the dramatic introduction[1] whereby the personages discoursing are brought together, we find Sokrates, Parmenides, and the Eleatic Zeno (the disciple of Parmenides), engaged in the main dialogue. When Parmenides begins his illustrative exercise, a person named Aristotle (afterwards one of the Thirty oligarchs at Athens), still younger than Sokrates, is made to serve as respondent.
[1] This dramatic introduction is extremely complicated. The whole dialogue, from beginning to end, is recounted by Kephalus of Klazomenæ; who heard it from the Athenian Antiphon — who himself had heard it from Pythodôrus, a friend of Zeno, present when the conversation was held. A string of circumstances are narrated by Kephalus, to explain how he came to wish to hear it, and to find out Antiphon. Plato appears anxious to throw the event back as far as possible into the past, in order to justify the bringing Sokrates into personal communication with Parmenides: for some unfriendly critics tried to make out that the two could not possibly have conversed on philosophy (Athenæus, xi. 505). Plato declares the ages of the persons with remarkable exactness: Parmenides was 65, completely grey-headed, but of noble mien: Zeno about 40, tall and graceful: Sokrates very young. (Plat. Parmen. p. 127 B-C.)
It required some invention in Plato to provide a narrator, suitable for recounting events so long antecedent as the young period of Sokrates.
Sokrates is one among various auditors, who are assembled to hear Zeno reading aloud a treatise of his own composition, intended to answer and retort upon the opponents of his preceptor Parmenides.
Manner in which the doctrine of Parmenides was impugned. Manner in which his partisan Zeno defended him.
The main doctrine of the real Parmenides was, “That Ens, the absolute, real, self-existent, was One and not many”: which doctrine was impugned and derided by various opponents, deducing from it absurd conclusions. Zeno defended his master by showing that the opposite doctrine ( — “That Ens, the absolute, self-existent universe, is Many — ”) led to conclusions absurd in an equal or greater degree. If the Absolute were Many, the many would be both like and unlike: but they cannot have incompatible and contradictory attributes: therefore Absolute Ens is not Many. Ens, as Parmenides conceived it, was essentially homogeneous and unchangeable: even assuming it to be Many, all its parts must be homogeneous, so that what was predicable of one must be predicable of all; it might be all alike, or all unlike: but it could not be both. Those who maintained the plurality of Ens, did so on the ground of apparent severalty, likeness, and unlikeness, in the sensible world. But Zeno, while admitting these phenomena in the sensible world, as relative to us, apparent, and subject to the varieties of individual estimation — denied their applicability to absolute and self-existent Ens.[2] Since absolute Ens or Entia are Many (said the opponents of Parmenides), they will be both like and unlike: and thus we can explain the phenomena of the sensible world. The absolute (replied Zeno) cannot be both like and unlike; therefore it cannot be many. We must recollect that both Parmenides and Zeno renounced all attempt to explain the sensible world by the absolute and purely intelligible Ens. They treated the two as radically distinct and unconnected. The one was absolute, eternal, unchangeable, homogeneous, apprehended only by reason. The other was relative, temporary, variable, heterogeneous; a world of individual and subjective opinion, upon which no absolute truth, no pure objectivity, could be reached.
[2] I have already given a short account of the Zenonian Dialectic, [ch. ii. p. 93] seq.
Sokrates here impugns the doctrine of Zeno. He affirms the Platonic theory of ideas separate from sensible objects, yet participable by them.
Sokrates, depicted here as a young man, impugns this doctrine of Zeno: and maintains that the two worlds, though naturally disjoined, were not incommunicable. He advances the Platonic theory of Ideas: that is, an intelligible world of many separate self-existent Forms or Ideas, apprehended by reason only — and a sensible world of particular objects, each participating in one or more of these Forms or Ideas. “What you say (he remarks to Zeno), is true of the world of Forms or Ideas: the Form of Likeness per se can never be unlike, nor can the Form of Unlikeness be ever like. But in regard to the sensible world, there is nothing to hinder you and me, and other objects which rank and are numbered as separate individuals, from participating both in the Form of likeness and in the Form of unlikeness.[3] In so far as I, an individual object, participate in the Form of Likeness, I am properly called like; in so far as I participate in the Form of Unlikeness, I am called unlike. So about One and Many, Great and Little, and so forth: I, the same individual, may participate in many different and opposite Forms, and may derive from them different and opposite denominations. I am one and many — like and unlike — great and little — all at the same time. But no such combination is possible between the Forms themselves, self-existent and opposite: the Form of Likeness cannot become unlike, nor vice versâ. The Forms themselves stand permanently apart, incapable of fusion or coalescence with each other: but different and even opposite Forms may lend themselves to participation and partnership in the same sensible individual object.”[4]