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. But we do
inquire what they are, viz. whether they are of such and such a nature
or not.
(b) As regards the 'being' that answers to truth and the
'non-being' that answers to falsity, in one case there is truth if the
subject and the attribute are really combined, and falsity if they are
not combined; in the other case, if the object is existent it exists
in a particular way, and if it does not exist in this way does not
exist at all. And truth means knowing these objects, and falsity
does not exist, nor error, but only ignorance-and not an ignorance
which is like blindness; for blindness is akin to a total absence of
the faculty of thinking.
It is evident also that about unchangeable things there can be
no error in respect of time, if we assume them to be unchangeable.
E.g. if we suppose that the triangle does not change, we shall not
suppose that at one time its angles are equal to two right angles
while at another time they are not (for that would imply change). It
is possible, however, to suppose that one member of such a class has a
certain attribute and another has not; e.g. while we may suppose
that no even number is prime, we may suppose that some are and some
are not. But regarding a numerically single number not even this
form of error is possible; for we cannot in this case suppose that one
instance has an attribute and another has not, but whether our
judgement be true or false, it is implied that the fact is eternal
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