Xenophanes and
Melissus; but Parmenides seems in places to speak with more insight.
For, claiming that, besides the existent, nothing non-existent exists,
he thinks that of necessity one thing exists, viz. the existent and
nothing else (on this we have spoken more clearly in our work on
nature), but being forced to follow the observed facts, and
supposing the existence of that which is one in definition, but more
than one according to our sensations, he now posits two causes and two
principles, calling them hot and cold, i.e. fire and earth; and of
these he ranges the hot with the existent, and the other with the
non-existent.
From what has been said, then, and from the wise men who have
now sat in council with us, we have got thus much-on the one hand from
the earliest philosophers, who regard the first principle as corporeal
(for water and fire and such things are bodies), and of whom some
suppose that there is one corporeal principle, others that there are
more than one, but both put these under the head of matter; and on the
other hand from some who posit both this cause and besides this the
source of movement, which we have got from some as single and from
others as twofold.
Down to the Italian school, then, and apart from it,
philosophers have treated these subjects rather obscurely, except
that, as we said, they have in fact used two kinds of cause, and one
of these-the source of movement-some treat as one and others as two.
But the Pythagoreans have said in the same way that there are two
principles, but added this much, which is peculiar to them, that
they thought that finitude and infinity were not attributes of certain
other things, e.
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