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We must, with a view to the science which we are seeking, first recount
the subjects that should be first discussed. |
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The first problem concerns the subject which we discussed in our
prefatory remarks. |
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(1) whether the investigation of the
causes belongs to one or to more sciences, and
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(2) whether such a
science should survey only the first principles of substance, or also
the principles on which all men base their proofs, e.g. whether it
is possible at the same time to assert and deny one and the same thing
or not, and all other such questions; |
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(3) if the science in question
deals with substance, whether one science deals with all substances,
or more than one, and if more, whether all are akin, or some of them
must be called forms of Wisdom and the others something else. |
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(4) this itself is also one of the things that must be discussed - whether
sensible substances alone should be said to exist or others also besides
them, and whether these others are of one kind or there are several
classes of substances, as is supposed by those who believe both in
Forms and in mathematical objects intermediate between these and sensible
things. |
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(5) whether our investigation is concerned only with substances
or also with the essential attributes of substances. |
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(6), are the principles
and elements of things the genera, or the parts present in each thing,
into which it is divided; |
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(7) if they are the genera, are they
the genera that are predicated proximately of the individuals, or
the highest genera, e.g. is animal or man the first principle and
the more independent of the individual instance? |
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(8) we must inquire
and discuss especially whether there is, besides the matter, any thing
that is a cause in itself or not, and whether this can exist apart
or not, and whether it is one or more in number, and whether there
is something apart from the concrete thing (by the concrete thing
I mean the matter with something already predicated of it), or there
is nothing apart, or there is something in some cases though not in
others, and what sort of cases these are. |
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(9) we ask whether
the principles are limited in number or in kind, both those in the
definitions and those in the substratum; |
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(10) whether the principles
of perishable and of imperishable things are the same or different; |
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(11) there is the question which is hardest
of all and most perplexing, whether unity and being, as the Pythagoreans
and Plato said, are not attributes of something else but the substance
of existing things, or this is not the case, but the substratum is
something else, - as Empedocles says, love; |
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(12) we ask whether the principles
are universal or like individual things, and
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(13) whether they exist
potentially or actually, and further, whether they are potential or
actual in any other sense than in reference to movement; |
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(14), are numbers
and lines and figures and points a kind of substance or not, and if
they are substances are they separate from sensible things or present
in them? |