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

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Lecture 1

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.

Philosophers

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