Questioning what we know
- Descartes wrote "I think; therefore I am." He realised we could never be sure that our perceptions are true - Memories could be invented. Your room could be a hallucination. - The fact that he could ask questions meant that he existed.
- 100yrs later, Hume showed that we could never be sure that our understanding of cause & effect is true. No matter how often something occurred in the past, it is impossible to prove that it will happen in the future.
- Kant built said there is a difference between our perception of something & the thing in itself. All I can be sure about are my perceptions.
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