jan 1, 1619 - René Descartes (1596–1650)

Description:

History: René Descartes lived in the early 17th century, a period of scientific revolution, religious conflict, and philosophical upheaval. Europe was witnessing the collapse of the Aristotelian worldview and the rise of modern science, with figures like Galileo, Kepler, and Newton challenging traditional cosmology and physics. At the same time, the Protestant Reformation and the Catholic Counter-Reformation had fractured European intellectual and spiritual life. In this fragmented world, Descartes sought certainty — a universal method for knowledge that would be immune to doubt.

Ideas: Descartes is best known for his radical methodological doubt and the attempt to rebuild all knowledge on a foundation of absolute certainty.

Key philosophical ideas:
-Radical doubt: In his Meditations on First Philosophy, Descartes begins by doubting everything — the senses, the world, even mathematics — to see what, if anything, remains beyond doubt.

-Cogito ergo sum ("I think, therefore I am"): This is the first indubitable truth. Even if an evil demon deceives him about everything, the very act of doubting proves that he exists as a thinking being.

-Mind-body dualism: Descartes proposed a strict separation between mind (res cogitans) and body (res extensa). The mind is a non-material, thinking substance, while the body is extended matter governed by physical laws.

-Clear and distinct ideas: He argued that ideas which are clear and distinct to the mind must be true — a foundation for rationalist epistemology.

-God as guarantor of truth: Descartes uses the idea of a perfect God to secure the reliability of reason: a good God would not allow humans to be fundamentally deceived about basic rational truths.

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