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.
'Accident' has also (2) another meaning, i.e. all that attaches to
each thing in virtue of itself but is not in its essence, as having
its angles equal to two right angles attaches to the triangle. And
accidents of this sort may be eternal, but no accident of the other
sort is. This is explained elsewhere.
Book VI
1
WE are seeking the principles and the causes of the things that
are, and obviously of them qua being. For, while there is a cause of
health and of good condition, and the objects of mathematics have
first principles and elements and causes, and in general every science
which is ratiocinative or at all involves reasoning deals with
causes and principles, more or less precise, all these sciences mark
off some particular being-some genus, and inquire into this, but not
into being simply nor qua being, nor do they offer any discussion of
the essence of the things of which they treat; but starting from the
essence-some making it plain to the senses, others assuming it as a
hypothesis-they then demonstrate, more or less cogently, the essential
attributes of the genus with which they deal. It is obvious,
therefore, that such an induction yields no demonstration of substance
or of the essence, but some other way of exhibiting it. And
similarly the sciences omit the question whether the genus with
which they deal exists or does not exist, because it belongs to the
same kind of thinking to show what it is and that it is
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