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1. Once Descartes has eleminated the evil demon hypothesis by proving
that a benevolent God who is not a deceiver exists, it follows that:
- he no longer has any doubts about the senses.
- he no longer has doubts about the truths of mathematics.
- he no longer doubts that his essence is to be a thinking thing.
- he has a criterion to distinguish between dreaming and waking.
2. Descartes claims that he has proofs from all three faculties
(reason, imagination and the senses)
- that material objects exist in the external world. The proof from
the imagination:
- relies on the distinction between powers of active and passive
perception. Active perception is the working of the imagination, passive perception is sensation.
- relies on the distinction between essence and existence. Since
Descartes knows the essence of material bodies, they must exist.
- relies explicitly on the fact that God might be a deceiver.
- relies on the relation of the imagination to the senses.
- relies on finding a criterion between waking and sleeping.
3. Descartes gives a proof for the real distinction between the mind
and the body. This proof requires that:
- both the soul the body are indivisible.
- that the body has color, taste, smell and other sensible
qualities.
- that Descartes knows that the essence of the body is to be
extended, flexible and moveable, and that the essence of
- the mind is its potential for interaction with God.
- that the mind is in essence something extended flexible and
moveable.
- that God can create whatever Descartes (or anyone else capable
of such a feat) can clearly and distinctly perceive to be distinct.
4. Descartes dualism between mind and body involves a doctrine of two
way causal interaction. This doctrine holds that:
- Bodies effect minds in the imagination, while minds effect
bodies in the understanding.
- Bodies causally interact with minds by causing perceptions, and the
mind interacts with God, thereby coming to have knowledge.
- Bodies causally effect minds in action, minds causally effect
bodies by making the body perceive.
- Mind causally effect bodies in two ways, first by causing them
to perceive and second to act, bodies (being lower on the scale of being) cannot effect minds.
- Bodies causally effect minds in perception; while minds causally
effect bodies by making them act.
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