[57]
On the other hand species will give us clear proof of
genus, but is of little service for its elimination.
For example, justice is always a virtue, but that
which is not justice may still be a virtue, such as
fortitude, constancy or self-control. Genus therefore
cannot be eliminated by species unless all the species
included in the genus be eliminated, as for instance
in the following sentence: That which is neither rational
[p. 233]
nor mortal nor an animal is not a man.
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