The argument which follows is the most singular in Plato. It appears
to be an imitation, or parody, of the Zenonian dialectic, just as the
speeches in the Phaedrus are an imitation of the style of Lysias, or as
the derivations in the Cratylus or the fallacies of the Euthydemus are
a parody of some contemporary Sophist. The interlocutor is not supposed,
as in most of the other Platonic dialogues, to take a living part in the
argument; he is only required to say 'Yes' and 'No' in the right places.
A hint has been already given that the paradoxes of Zeno admitted of a
higher application. This hint is the thread by which Plato connects the
two parts of the dialogue.
The paradoxes of Parmenides seem trivial to us, because the words to
which they relate have become trivial; their true nature as abstract
terms is perfectly understood by us, and we are inclined to regard the
treatment of them in Plato as a mere straw-splitting, or legerdemain of
words. Yet there was a power in them which fascinated the Neoplatonists
for centuries afterwards. Something that they found in them, or brought
to them--some echo or anticipation of a great truth or error, exercised
a wonderful influence over their minds. To do the Parmenides justice, we
should imagine similar aporiai raised on themes as sacred to us, as the
notions of One or Being were to an ancient Eleatic. 'If God is, what
follows? If God is not, what follows?' Or again: If God is or is not the
world; or if God is or is not many, or has or has not parts, or is or is
not in the world, or in time; or is or is not finite or infinite. Or if
the world is or is not; or has or has not a beginning or end; or is or
is not infinite, or infinitely divisible. Or again: if God is or is not
identical with his laws; or if man is or is not identical with the laws
of nature. We can easily see that here are many subjects for thought,
and that from these and similar hypotheses questions of great interest
might arise. And we also remark, that the conclusions derived from
either of the two alternative propositions might be equally impossible
and contradictory.