Further, neither can the calculative
faculty or what is called 'mind' be the cause of such movement; for
mind as speculative never thinks what is practicable, it never says
anything about an object to be avoided or pursued, while this movement
is always in something which is avoiding or pursuing an object. No,
not even when it is aware of such an object does it at once enjoin
pursuit or avoidance of it; e.g. the mind often thinks of something
terrifying or pleasant without enjoining the emotion of fear. It is
the heart that is moved (or in the case of a pleasant object some
other part). Further, even when the mind does command and thought bids
us pursue or avoid something, sometimes no movement is produced; we
act in accordance with desire, as in the case of moral weakness.
And, generally, we observe that the possessor of medical knowledge
is not necessarily healing, which shows that something else is
required to produce action in accordance with knowledge; the knowledge
alone is not the cause. Lastly, appetite too is incompetent to account
fully for movement; for those who successfully resist temptation
have appetite and desire and yet follow mind and refuse to enact
that for which they have appetite.
10
These two at all events appear to be sources of movement: appetite
and mind (if one may venture to regard imagination as a kind of
thinking; for many men follow their imaginations contrary to
knowledge, and in all animals other than man there is no thinking or
calculation but only imagination).
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