Descartes’ Rationalism: Methodical Doubt and the First Truth
René Descartes (1596-1650)
The Father of Modern Philosophy
R. Descartes is considered the father of modern philosophy and a key figure in rationalism. His work marked a new stage in philosophy, characterized by the absolute autonomy of reason. This autonomy meant that reason was not to be curtailed by external factors such as tradition, authority, or religious faith.
Rationalism
Rationalism considers reason the primary source of knowledge, upholds the innateness of ideas, aspires to a universal philosophy, and uses mathematical procedures as a model for knowledge. Descartes’ basic aim was to achieve philosophical truth through reason by identifying and implementing a method to demonstrate truths systematically.
Descartes’ Philosophical Ideal
Descartes’ ideal was a system of truths, arranged so that the mind could progress from self-evident truths to others implied by them, an ideal largely inspired by mathematics.
Implementation of Methodological Doubt and Discovery of the First Truth
Cogito, ergo sum
Main Ideas:
- Doubt applies to knowledge gained through the senses because they can deceive us.
- Doubt also applies to reasoning, as people can make mistakes even in simple geometry.
- Doubt extends to the reality of perceptions, which are no more true than dreams.
After methodical doubt, Descartes arrives at the first truth: I think, therefore I am (Cogito, ergo sum). This truth is so firm that no skepticism can shake it, becoming the first principle of his philosophy.
Explanation of Ideas:
This text presents Descartes’ methodical doubt and the discovery of the first truth. Methodical doubt is a process of philosophical inquiry where Descartes doubts everything possible to find absolute certainty.
- The Senses: Descartes questions the knowledge from the senses because they can deceive us.
- Reasoning: He extends doubt to arguments since logical errors are possible.
- Reality vs. Dreams: Descartes introduces doubt about distinguishing wakefulness from sleep, questioning the reality of our perceptions.
After applying methodical doubt, Descartes arrives at the first truth: I think, therefore I am (Cogito, ergo sum). Even if doubting, the act of thinking proves existence. This is an immediate, clear, and distinct idea revealed through intuition: the inability to think without existing.
The Evil Genius Hypothesis
In addition to the grounds for doubt in Discourse on the Method, Descartes presents the evil genius hypothesis in his Meditations. This hyperbolic doubt suggests a powerful, evil being deceives humans, causing errors even in the most evident matters. This hypothesis necessitates further proof of a good God.