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In Meditations on First Philosophy the philosopher René Descartes describes a series of doubts about the nature of reality, arriving at the famous phrase:

• [[I thin]]

• I think therefore I am

• Just think about it

• Thinking, Fast and Slow
  Books/

• The Thing
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He argues that doubting requires thinking, and therefore, the act of thinking confirms his existence.

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Philosophy Books René Descartes

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Rationalists

• Reason and innate knowledge → acquire knowledge
• Fundamental truths and principles can be known independent of experience
• A priori reasoning
• Reason and deduction

Empiricists

• Experience and sensory perception → acquire knowledge
• All knowledge is derived from experience and observation of the external world
• A posteriori reasoning

Cogito, ergo sum

In Meditations on First Philosophy the philosopher René Descartes describes a series of doubts about the nature of reality, arriving at the famous phrase:

I think therefore I am

He argues that doubting requires thinking, and therefore, the act of thinking confirms his existence.