Philosophical Works · Chapter
Discourse on the Method of Rightly Conducting One’s Reason and of Seeking Truth in the Sciences explained
Descartes introduces his method of systematic doubt and rational inquiry, rejecting uncertain beliefs to establish a foundation for knowledge.
What happens
Descartes introduces his method of systematic doubt and rational inquiry, rejecting uncertain beliefs to establish a foundation for knowledge. He recounts his education, his decision to doubt all that is not certain, and his discovery of the cogito as the first principle of philosophy. The chapter outlines his methodical approach to seeking truth and his provisional moral code, leading to proofs of God's existence and the distinction between mind and body.
Themes in this chapter
Methodical Doubt
Descartes systematically doubts all beliefs that are not absolutely certain, including sensory perceptions and mathematical truths, to find an indubitable foundation for knowledge.
Cogito Ergo Sum (I Think, Therefore I Am)
The cogito emerges as the first principle of philosophy, establishing the self as a thinking thing and providing a starting point for further knowledge.
Characters to notice
- Narrator
The first-person narrator, representing Descartes, recounts his intellectual journey and method.
- René Descartes
The author and protagonist, who develops and applies the method of doubt to establish certain knowledge.
- God
Invoked as the guarantor of clear and distinct perceptions and as the source of the idea of perfection.
- Aristotle
Mentioned as a traditional philosopher whose teachings are part of the scholastic education Descartes critiques.
- Plato
Referenced as a classical philosopher whose ideas are contrasted with Descartes' new method.
Key passages
“I thought that the sciences found in books... are not so near to the truth as the simple reasonings which a man of good sense can naturally make concerning the things that present themselves.”
Descartes argues that bookish learning is less reliable than the natural reasoning of a sensible person about everyday matters.
This reflects his critique of traditional scholastic education and his emphasis on individual reason.
“I resolved to assume that everything that ever entered my mind was no more true than the illusions of my dreams.”
He decides to treat all his former beliefs as potentially false, like dream images, in order to find certain knowledge.
This is the core of his methodical doubt, leading to the cogito.
“I think, therefore I am, was so firm and so assured that all the most extravagant suppositions of the skeptics were unable to shake it.”
The statement 'I think, therefore I am' is indubitable, resisting even the most radical skeptical challenges.
This is the foundational certainty from which Descartes rebuilds knowledge.
“I saw that I could consider the body, that is, the extension of matter, as a machine... and that the soul is entirely distinct from the body.”
Descartes distinguishes the mind (soul) from the body, viewing the body as a mechanical entity and the mind as a thinking substance.
This introduces his mind-body dualism, a key theme in the chapter.