方法序説のあらすじ

The 8 key ideas

1. Key idea 1 · free to read

   Good sense is shared, so use it well

   Descartes opens with a playful claim. Good sense, the power to tell truth from error, is the most evenly shared of human gifts. Even people who are never satisfied with what they own do not ask for more of it. So differences of opinion come from people sending their thoughts down different paths.

   A quick mind is not enough, he adds. A slow traveler who keeps to the right road can outrun a runner who strays. His one piece of luck was finding early a method that lets him add to his knowledge step by step. He offers it only as a story, and what he takes for gold and diamonds may be copper and glass.

   He studied at one of the best schools in Europe, and he finished by doubting nearly all of it. So he set his books aside and travelled, reading what he calls the book of the world. He saw that other nations hold customs that look absurd to us, yet reason as well as we do. That cured him of trusting beliefs that rest on habit alone.

   Trust reason you have used with care, and test every inherited belief against the world.

2. 2

   Rebuild your own house, not the whole town

   Winter stops Descartes in a quiet place on his way back to the army.

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3. 3

   Four simple rules can guide any inquiry

   Descartes looks at the tools he knows and finds each one lacking.

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4. 4

   Live by simple rules while you doubt

   Pulling down a house means you need somewhere to live while the work goes on.

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5. 5

   Doubt everything, and one truth still stands

   Descartes decides to treat as false anything he can doubt even slightly, to see whether something is left that nothing can shake.

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6. 6

   Clear ideas are trusted because God is truthful

   Doubting shows Descartes that he is imperfect, since knowing is a greater perfection than doubting.

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7. 7

   The body works like a machine, but reason sets us apart

   Descartes sums up a treatise he has chosen not to publish.

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8. 8

   Knowledge should serve people and be built together

   Three years after Descartes finishes his treatise, he begins revising it for publication and hears that respected judges have condemned another writer's doctrine in physics.

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