Yet a principle of this kind gives rise to a difficulty in some cases.
For some people hold that prudence is both virtue and knowledge, and
that neither of its genera is embraced by the other: although
certainly not everybody admits that prudence is knowledge. If,
however, any one were to admit the truth of this assertion, yet it
would still be generally agreed to be necessary that the genera of the
same object must at any rate be subordinate either the one to the
other or both to the same, as actually is the case with virtue and
knowledge. For both fall under the same genus; for each of them is a
state and a disposition. You should look, therefore, and see whether
neither of these things is true of the genus rendered; for if the
genera be subordinate neither the one to the other nor both to the
same, then what is rendered could not be the true genus.
Look, also, at the genus of the genus rendered, and so continually
at the next higher genus, and see whether all are predicated of the
species, and predicated in the category of essence: for all the higher
genera should be predicated of the species in the category of essence.
If, then, there be anywhere a discrepancy, clearly what is rendered is
not the true genus.
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