If we were, it would follow that
contraries would be predicated of the same subject; for when
Anaxagoras says that in everything there is a part of everything, he
says nothing is sweet any more than it is bitter, and so with any
other pair of contraries, since in everything everything is present
not potentially only, but actually and separately. And similarly all
statements cannot be false nor all true, both because of many other
difficulties which might be adduced as arising from this position, and
because if all are false it will not be true to say even this, and
if all are true it will not be false to say all are false.
7
Every science seeks certain principles and causes for each of
its objects-e.g. medicine and gymnastics and each of the other
sciences, whether productive or mathematical. For each of these
marks off a certain class of things for itself and busies itself about
this as about something existing and real,-not however qua real; the
science that does this is another distinct from these. Of the sciences
mentioned each gets somehow the 'what' in some class of things and
tries to prove the other truths, with more or less precision. Some get
the 'what' through perception, others by hypothesis; so that it is
clear from an induction of this sort that there is no demonstration.
of the substance or 'what'.
There is a science of nature, and evidently it must be different
both from practical and from productive science. For in the case of
productive science the principle of movement is in the producer and
not in the product, and is either an art or some other faculty.
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