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. Again, demonstration is a necessary thing because the
conclusion cannot be otherwise, if there has been demonstration in the
unqualified sense; and the causes of this necessity are the first
premisses, i.e. the fact that the propositions from which the
syllogism proceeds cannot be otherwise.
Now some things owe their necessity to something other than
themselves; others do not, but are themselves the source of
necessity in other things. Therefore the necessary in the primary
and strict sense is the simple; for this does not admit of more states
than one, so that it cannot even be in one state and also in
another; for if it did it would already be in more than one. If, then,
there are any things that are eternal and unmovable, nothing
compulsory or against their nature attaches to them.
6
'One' means (1) that which is one by accident, (2) that which is
one by its own nature. (1) Instances of the accidentally one are
'Coriscus and what is musical', and 'musical Coriscus' (for it is
the same thing to say 'Coriscus and what is musical', and 'musical
Coriscus'), and 'what is musical and what is just', and 'musical
Coriscus and just Coriscus'. For all of these are called one by virtue
of an accident, 'what is just and what is musical' because they are
accidents of one substance, 'what is musical and Coriscus' because the
one is an accident of the other; and similarly in a sense 'musical
Coriscus' is one with 'Coriscus' because one of the parts of the
phrase is an accident of the other, i
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