Discourse on Method: 8 key ideas
The core ideas of Discourse on Method, each in under a minute, written in our own words. Want the full depth? Get the book.
- IDEA 1 OF 8
Descartes tells how he sought truth
Descartes describes his own education and his disappointment that the schools taught so much that was uncertain.
He decided to find a reliable method for reaching truth, and he presents his search as a personal story rather than a textbook.
- IDEA 2 OF 8
Accept only what is evident
His first rule of method is never to accept anything as true unless it is so clear and distinct that it cannot be doubted.
This rule guards against hasty judgement and prejudice.
- IDEA 3 OF 8
Divide difficulties into parts
Descartes's second rule is to break each problem into as many small parts as possible.
Smaller parts are easier to understand and solve. Complex problems become a series of simpler, manageable steps.
- IDEA 4 OF 8
Move from simple to complex
His third rule is to think in an orderly way, starting with the simplest things and moving step by step to the more complex.
This mirrors the method of mathematics.
- IDEA 5 OF 8
Check that nothing is missed
His fourth rule is to make complete reviews and lists, so that nothing important is left out.
Careful checking ensures that reasoning is thorough. Reviewing each step helps catch errors that might otherwise slip through.
- IDEA 6 OF 8
Live by a temporary morality
While doubting everything, Descartes adopted a provisional morality: obey local laws and customs, be firm in decisions and change himself rather than the world.
This let him live calmly during his search.
- IDEA 7 OF 8
Thinking proves existence
Descartes describes reaching the certainty that he exists because he thinks.
This became the foundation for his philosophy. From this one certain point, he hoped to rebuild knowledge on firm foundations.
- IDEA 8 OF 8
Animals are like machines
Descartes argues that animals are complex machines without minds, unlike humans who can think and use language.
This view was influential but is widely rejected today. Modern science has shown that many animals feel and think.
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