Thus (e.g.) inasmuch as it is not a property
of 'man' to be an animal, neither could it be a property of becoming a
man to become an animal; nor could the destruction of an animal be a
property of the destruction of a man. In the same way one should
derive arguments also from 'becoming' to 'being' and 'being
destroyed', and from 'being destroyed' to 'being' and to 'becoming'
exactly as they have just been given from 'being' to 'becoming' and
'being destroyed'. For constructive purposes, on the other hand, see
if the subject set down as qualified by the verb 'to be' has the
predicate set down as so qualified, as its property: for then also the
subject qualified by the very 'to become' will have the predicate
qualified by 'to become' as its property, and the subject qualified by
the verb to be destroyed' will have as its property the predicate
rendered with this qualification. Thus, for example, inasmuch as it is
a property of man to be a mortal, it would be a property of becoming a
man to become a mortal, and the destruction of a mortal would be a
property of the destruction of a man. In the same way one should
derive arguments also from 'becoming' and 'being destroyed' both to
'being' and to the conclusions that follow from them, exactly as was
directed also for the purpose of destruction.
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