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Daily · Philosophy

Discourse on the Method

René Descartes · philosophical treatise, 1637·2 hrs in the original·original at gutenberg.org
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  • The four rules of method: Descartes reduces sound inquiry to four precepts: accept nothing as true unless it is clear and distinct, divide problems into parts, proceed from the simplest to the most complex, and review so thoroughly that nothing is omitted.
  • Cogito ergo sum: By resolving to doubt everything that could be doubted, including the senses and the external world, Descartes finds one indubitable certainty: that the very act of thinking proves his own existence, and from this he concludes that the mind is a substance wholly distinct from the body.
  • God's existence as guarantor of knowledge: Descartes argues that the idea of a perfect being could not originate in an imperfect mind, so God must exist, and because God is not a deceiver, whatever we perceive clearly and distinctly must be true, grounding all subsequent knowledge.
  • The body as machine, the soul as unique: Descartes describes the heart and blood circulation in mechanical terms, endorsing Harvey's discovery, and argues that while animal bodies are automata, humans are distinguished by language and universal reason, which no arrangement of organs could produce, pointing to an immortal rational soul.
  • Science for human benefit: In the final part Descartes explains that he withheld a fuller treatise after learning of the condemnation of Galileo, but declares his life's aim to be a practical philosophy that would make humanity 'lords and possessors of nature,' above all through advances in medicine that might free people from disease and perhaps even the debility of age.
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•Why it earns a slot

The Discourse is the text in which Descartes first published the cogito, introduced systematic methodological doubt as a philosophical tool, and articulated the mind-body distinction, making it one of the founding documents of modern Western philosophy and scientific method.

Descartes describes his personal intellectual journey from disillusionment with received learning to the discovery of a four-rule method for reasoning clearly and finding truth. He applies this method to establish foundational certainties, including the famous 'I think, therefore I am,' proofs for the existence of God and the soul, and a mechanical account of the human body. The work closes with his reasons for publishing selectively and his commitment to advancing natural science, especially medicine, for the benefit of humanity.

This distillation is written from the freely available original, which is always the better read when you have the time: gutenberg.org.

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