We said
before that there are two parts of the soul-that which grasps a rule
or rational principle, and the irrational; let us now draw a similar
distinction within the part which grasps a rational principle. And let
it be assumed that there are two parts which grasp a rational
principle-one by which we contemplate the kind of things whose
originative causes are invariable, and one by which we contemplate
variable things; for where objects differ in kind the part of the soul
answering to each of the two is different in kind, since it is in
virtue of a certain likeness and kinship with their objects that
they have the knowledge they have. Let one of these parts be called
the scientific and the other the calculative; for to deliberate and to
calculate are the same thing, but no one deliberates about the
invariable. Therefore the calculative is one part of the faculty which
grasps a rational principle. We must, then, learn what is the best
state of each of these two parts; for this is the virtue of each.
2
The virtue of a thing is relative to its proper work. Now there
are three things in the soul which control action and truth-sensation,
reason, desire.
Of these sensation originates no action; this is plain from the fact
that the lower animals have sensation but no share in action.
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