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. And if there is a
first thing, which is no longer, in reference to something else,
called 'thaten', this is prime matter; e.g. if earth is 'airy' and air
is not 'fire' but 'fiery', fire is prime matter, which is not a
'this'. For the subject or substratum is differentiated by being a
'this' or not being one; i.e. the substratum of modifications is, e.g.
a man, i.e. a body and a soul, while the modification is 'musical'
or 'pale'. (The subject is called, when music comes to be present in
it, not 'music' but 'musical', and the man is not 'paleness' but
'pale', and not 'ambulation' or 'movement' but 'walking' or
'moving',-which is akin to the 'thaten'.) Wherever this is so, then,
the ultimate subject is a substance; but when this is not so but the
predicate is a form and a 'this', the ultimate subject is matter and
material substance. And it is only right that 'thaten' should be
used with reference both to the matter and to the accidents; for
both are indeterminates.
We have stated, then, when a thing is to be said to exist
potentially and when it is not.
8
From our discussion of the various senses of 'prior', it is
clear that actuality is prior to potency. And I mean by potency not
only that definite kind which is said to be a principle of change in
another thing or in the thing itself regarded as other, but in general
every principle of movement or of rest
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