The Problems of Philosophy · Character

Descartes

The French philosopher who doubted everything a reasonable man could doubt, then rebuilt certainty from the one thing doubt could not touch.

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First appearance: II: The Existence of Matter

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Introduced as a philosopher who employed systematic doubt to question the certainty of sensory knowledge.

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Descartes sets the tone for the whole inquiry: the opening question of whether any knowledge is certain enough that no reasonable man could doubt it is essentially his. His method of doubt turns the familiar table, the sun, the chair beneath us into problems, and his cogito becomes the first foothold Russell tests rather than simply accepts. He matters because he makes radical doubt feel like a procedure rather than a mood—and because the book's early chapters are, in effect, a running conversation with his demand for foundations.

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See Descartes in II: The Existence of Matter

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Historical and philosophical figures
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Story tension across the book — this chapter sits in Exposition.

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Escalation
Breaking point
Aftermath
Closing

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Bishop Berkeley
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Berkeley critiques Descartes' dualism and materialism from an idealist perspective. How this plays out →

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See Descartes in II: The Existence of Matter

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Descartes appears across 6 companion beats. Open any chapter in the free preview to see the notes beside the text.

The Problems of Philosophy
Introduced as a philosopher who employed systematic doubt to question the certainty of sensory knowledge.
II: The Existence of Matter
Introduced as the founder of modern philosophy; his method of systematic doubt and the cogito argument are discussed as a starting point for certainty.
Idealism
Mentioned in the context of the method of systematic doubt and the question of certainty, though not central to this chapter.
VII: On Our Knowledge of General Principles
Mentioned as a representative of rationalist philosophy, holding that there are innate ideas and principles known independently of experience.
XIV: The Limits of Philosophical Knowledge
Russell references Descartes' methodical doubt as the kind of criticism that constitutes philosophy, distinguishing it from absolute skepticism.
Bibliographical Note
Recommended work: Meditations.

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See Descartes in II: The Existence of Matter

See Descartes in The Problems of Philosophy