Understanding Descartes' Core Ideas
Classified in Philosophy and ethics
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Descartes' Philosophy
The Existence of the World
To address the existence of the physical world, Descartes examines the ideas of sensible things. Given our natural inclination to believe these ideas originate from the sensible world, and considering God's non-deceptive nature, Descartes concludes that this inclination is truthful. Therefore, sensible things exist extramentally, guaranteed by God's veracity. However, only what is clearly and distinctly perceived—extension, movement, and shape (primary qualities)—holds true external existence. Other qualities like sound, color, and taste (secondary qualities) are subjective, existing only within the perceiver. This aligns with Galileo's distinction between primary and secondary qualities.