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© Michael Lacewing
Rationalism and empiricism
Michael Lacewing
enquiries@alevelphilosophy.co.uk
Epistemology
• How do we know what we know?
• Types of knowledge
– Acquaintance: I know Oxford well.
– Know how: I know how to ride a bike.
– Propositional: I know that elephants are
grey.
• Belief v. knowledge
– Knowledge has a justification or evidence
Reason and experience
• The terms ‘rationalist’ and ‘empiricist’ can
be applied to
– theories of knowledge
– theories of concept acquisition
– theories of justification
– historical schools of thought
• Why choose reason or experience?
– Most rationalists allow knowledge from
experience.
– All empiricists use reasoning to establish
conclusions.
Reason and experience
• Experience: just sense
experience? What
about religious
experience?
• Reason: just
reasoning? What
about intuition?
A clear distinction
• Rationalism: we can have substantive a
priori knowledge of how things stand
outside the mind.
• Empiricism: we cannot.
Substantive knowledge
• Substantive knowledge is knowledge of a
synthetic proposition. Trivial knowledge is
knowledge of an analytic proposition.
– An analytic proposition is true or false in virtue
of the meanings of the words.
– Not all analytic propositions are obvious: ‘In five
days time, it will have been a week since the day
which was tomorrow three days ago’ - true or
false?
A priori knowledge
• A priori: knowledge that does not
require (sense) experience to be
known to be true (v. a posteriori)
• It is not a claim that no experience was
necessary to arrive at the claim, but
that none is needed to prove it.
Two quick points
• Empiricists do not claim there is no a
priori knowledge; they deny there is
substantive a priori knowledge.
• Rationalists (except for Plato) do not
claim sense experience can never
provide knowledge.

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Rationalism-and-empiricism.ppt

  • 1. © Michael Lacewing Rationalism and empiricism Michael Lacewing enquiries@alevelphilosophy.co.uk
  • 2. Epistemology • How do we know what we know? • Types of knowledge – Acquaintance: I know Oxford well. – Know how: I know how to ride a bike. – Propositional: I know that elephants are grey. • Belief v. knowledge – Knowledge has a justification or evidence
  • 3. Reason and experience • The terms ‘rationalist’ and ‘empiricist’ can be applied to – theories of knowledge – theories of concept acquisition – theories of justification – historical schools of thought • Why choose reason or experience? – Most rationalists allow knowledge from experience. – All empiricists use reasoning to establish conclusions.
  • 4. Reason and experience • Experience: just sense experience? What about religious experience? • Reason: just reasoning? What about intuition?
  • 5. A clear distinction • Rationalism: we can have substantive a priori knowledge of how things stand outside the mind. • Empiricism: we cannot.
  • 6. Substantive knowledge • Substantive knowledge is knowledge of a synthetic proposition. Trivial knowledge is knowledge of an analytic proposition. – An analytic proposition is true or false in virtue of the meanings of the words. – Not all analytic propositions are obvious: ‘In five days time, it will have been a week since the day which was tomorrow three days ago’ - true or false?
  • 7. A priori knowledge • A priori: knowledge that does not require (sense) experience to be known to be true (v. a posteriori) • It is not a claim that no experience was necessary to arrive at the claim, but that none is needed to prove it.
  • 8. Two quick points • Empiricists do not claim there is no a priori knowledge; they deny there is substantive a priori knowledge. • Rationalists (except for Plato) do not claim sense experience can never provide knowledge.