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Thus, then, are natural products produced; all other productions
are called 'makings'. And all makings proceed either from art or
from a faculty or from thought. Some of them happen also spontaneously
or by luck just as natural products sometimes do; for there also the
same things sometimes are produced without seed as well as from
seed. Concerning these cases, then, we must inquire later, but from
art proceed the things of which the form is in the soul of the artist.
(By form I mean the essence of each thing and its primary
substance.) For even contraries have in a sense the same form; for the
substance of a privation is the opposite substance, e.g. health is the
substance of disease (for disease is the absence of health); and
health is the formula in the soul or the knowledge of it. The
healthy subject is produced as the result of the following train of
thought:-since this is health, if the subject is to be healthy this
must first be present, e.g. a uniform state of body, and if this is to
be present, there must be heat; and the physician goes on thinking
thus until he reduces the matter to a final something which he himself
can produce. Then the process from this point onward, i.e. the process
towards health, is called a 'making'. Therefore it follows that in a
sense health comes from health and house from house, that with
matter from that without matter; for the medical art and the
building art are the form of health and of the house, and when I speak
of substance without matter I mean the essence
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