Philosopher · 1596 – 1650
René Descartes
Key Takeaways
- Descartes is called the father of modern philosophy.
- His method of systematic doubt led to "I think, therefore I am" (Cogito, ergo sum).
- He founded analytic geometry, uniting algebra and geometry.
- He was a leading rationalist, holding reason as the source of certain knowledge.
René Descartes is called the father of modern philosophy. Living at the dawn of the Scientific Revolution, he sought to rebuild human knowledge on foundations so secure that no doubt could shake them.
Methodical doubt
Descartes resolved to doubt everything he could — the senses, the world, even mathematics — until he reached something certain. He found it in the very act of thinking: however much he doubted, he could not doubt that he was doubting. Hence his famous conclusion, “I think, therefore I am” (Cogito, ergo sum).
Mathematician
Descartes was also a mathematical revolutionary. By uniting algebra and geometry, he founded analytic geometry and the coordinate system that still bears his name (“Cartesian”). This fusion gave Newton and later scientists an indispensable tool.
Legacy
By placing the thinking self at the center of philosophy, Descartes set the agenda for the modern age. His rationalism — and his sharp split between mind and body — provoked centuries of debate, culminating in the great synthesis of Immanuel Kant.
Influence
Descartes reframed philosophy around the thinking subject and the quest for certainty, and his analytic geometry became an essential tool of modern mathematics and physics.
Legacy
As the father of modern philosophy and a founder of analytic geometry, Descartes shaped both the humanities and the sciences; the Cartesian coordinate system bears his name.
Major Works
- Discourse on the Method
- Meditations on First Philosophy
Controversies
- His sharp separation of mind and body (Cartesian dualism) has been debated and criticized ever since.
Notable Quotes
“I think, therefore I am.”
“It is not enough to have a good mind; the main thing is to use it well.”
Connections
Frequently Asked Questions
Who was René Descartes?
René Descartes (1596–1650) was a French philosopher and mathematician, the father of modern philosophy, famous for 'I think, therefore I am' and for founding analytic geometry.
What is Cartesian dualism?
It is Descartes's view that mind and body are two fundamentally distinct kinds of substance — a thinking thing and an extended physical thing.
Citations & Sources
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