In "Meditation One", Rene Descartes begins his search for knowledge---for
knowledge that can withstand challenges and provide the solid foundation he sought for the
sciences. It is interesting that a positive search for knowledge should begin here,
though, since this meditation stands out as one of the most forceful expressions of
epistemological skepticism ever produced. That is by design, however, since he is after
knowledge that can withstand even this type of assault.
Knowledge
For Descartes, knowledge is justified true belief.
A. "Belief" is a relationship between us in virtue of a cognitive
representation and the world.
B. "Truth", for our purposes, will be a property of claims when those claims
describe the world the way it really is.
C. "Justification": for Descartes, as we'll see, this is absolute
certainty---indubitability.
Meditation One: Skepticism, Cartesian Style
- Descartes' skepticism is "methodological skepticism"---he does not embrace it
as a fact in the end. He uses it as a means to acquire knowledge.
- In fact, you can take the Meditations to be his attempt at applying the method he
develops in the Discourse on Method to the foundations of the sciences. The
skeptical work in the first Meditation is the analysis, and the synthesis is found in the
remaining 5 meditations.
- Descartes' brand of skepticism is also called "epistemological skepticism,"
which is a deep and thoroughgoing rejection of the possibility of knowledge. (Focus on the
principles and on his definition of knowledge.)
- His challenge is very important to the layman: if we cannot answer him, we may have to
reconsider the standards we apply to our investigation of the world.
- GOAL: Descartes' primary goal in the Meditations was to
establish a firm foundation for the sciences---to establish "firm and lasting
knowledge."
- He believed this was impossible so long as one's belief system contained falsehoods.
- He was convinced that the only way he could achieve his goal would be to raze this
structure and then rebuild it accepting only beliefs the truth of which he was
certain---this was his way of getting JUSTIFICATION.
- METHOD: His was the SKEPTICAL METHOD---to reject as false
any belief that could be doubted.
- Implication: that knowledge rests on indubitable belief---that with
indubitability (and the absence of prejudice and blind faith in the senses) comes
justification and truth.
- He applies this method to the foundational principles of his belief system and not to
each belief individually.
- THE PRINCIPLES:
- These derive from his target, Aristotelian science. (In a letter to his friend Mersenne,
he confessed that the real goal of his Meditations was to refute Aristotelian science and
replace it with his own.)
- For Aristotle, knowledge was ultimately grounded in sense experience; however, in
addition, other faculties of the soul---the imagination and the intellect---were capable
of contributing to one's store of beliefs.
- Therefore, Descartes focuses on 3 types of beliefs in applying his method: those that
are sense-based (e.g., sitting by the fire), those that are imagination-based, and those
that are based in the intellect. If he could cast doubt on these, the edifice of his
beliefs would come crashing down.
- THE ARGUMENTS:
- Against sense-based beliefs:
- Perceptual beliefs about distant objects: Illusion.
- Perceptual beliefs about proximate objects: Dreams.
- Against imagination-based beliefs:
- Example include those created in dreams.
- Composite beliefs such as these can be dismissed as dubitable, more or less on their
face.
- Against intellect-based beliefs:
- These include mathematical beliefs of the kind that underpin arithmetic and geometry.
(E.g., shape, extension, number, etc.)
- Deceiving God: Either there is a God or not; if so, then it is possible that he
is a deceiver, and if he is a deceiver, then you could be wrong about what you consider
most certain; if there is no God, then chance rules and we have even less reason to trust
the dictates of our intellect.
- CONCLUSION: All beliefs that constitute his belief system are
dubitable, and so are rejected as false. He is therefore mired in a deep skepticism. Keep
in mind, though, that this is a philosophical skepticism and not a practical skepticism;
nevertheless, he has to fight against erosion of his philosophical position brought on by
the practical situation in which he finds himself.
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