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. Regarding contingent facts,
then, the same opinion or the same statement comes to be false and
true, and it is possible for it to be at one time correct and at
another erroneous; but regarding things that cannot be otherwise
opinions are not at one time true and at another false, but the same
opinions are always true or always false.
But with regard to incomposites, what is being or not being, and
truth or falsity? A thing of this sort is not composite, so as to 'be'
when it is compounded, and not to 'be' if it is separated, like
'that the wood is white' or 'that the diagonal is incommensurable';
nor will truth and falsity be still present in the same way as in
the previous cases. In fact, as truth is not the same in these
cases, so also being is not the same; but (a) truth or falsity is as
follows--contact and assertion are truth (assertion not being the same
as affirmation), and ignorance is non-contact. For it is not
possible to be in error regarding the question what a thing is, save
in an accidental sense; and the same holds good regarding
non-composite substances (for it is not possible to be in error
about them). And they all exist actually, not potentially; for
otherwise they would have come to be and ceased to be; but, as it
is, being itself does not come to be (nor cease to be); for if it
had done so it would have had to come out of something. About the
things, then, which are essences and actualities, it is not possible
to be in error, but only to know them or not to know them
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