Descartes’ Method: Unveiling Truth Through Reason
Chapters II and IV of the *Discourse on Method*
This text is a fragment discussed in Chapters II and IV of the Discourse on Method by Descartes. This fundamental work of modern philosophy, written in French, reflects his epistemological concerns and the search for a new method, replacing the concept of Scholasticism. Descartes, a 17th-century French philosopher, sought to uncover the truth by using reason as a criterion. Reason, he argued, is autonomous, infallible, unique, and powerful, and it must follow the mathematical model to arrive at truth.
Chapter II: The Unity of Knowledge and the Rules of the Method
In Chapter II, Descartes presents five examples supporting the thesis about the unity of knowledge (architects and buildings, engineers and cities, peoples and their legislation, scholastic philosophy and its composite nature, man and his opinions). He then shows the advantages and flaws of logic, geometry, and algebra. Finally, he presents the rules of the method and the ways of knowing. According to Descartes, reason has two ways of knowing:
- Intuition, which involves the immediate grasp of truth.
- Deduction, which is establishing connections between ideas.
However, to correctly use reason, Descartes proposes a method with four rules:
- Rational evidence: This represents the Cartesian criterion of truth with characteristics of clarity (presence to an attentive mind) and distinction (separate and distinct idea from others, without being able to be confused with another).
- Analysis: This is dividing complex ideas into their simplest elements to be taken up by intuition.
- Synthesis: This allows us to rebuild and move from the simple to the complex through deduction.
- Revision or enumeration: This is examining the above strings carefully to ensure no errors were committed.
In the method, we must avoid two faults or sources of error:
- Precipitation: Taking a confused idea as true.
- Prevention: Refusing to accept an idea despite being clear and distinct.
The method allows progress with order, chaining, and knowledge based on the unity of science.
Chapter IV: Methodical Doubt and the First Truths
In Chapter IV, Descartes seeks evident first principles upon which to build his system of philosophy. As a means to achieve this, he proposes methodical doubt, which is doubting all opinions to establish something firm.
According to Descartes, we should doubt:
- The sensible world (and body) because the senses can deceive us.
- Reality in general because we confound waking and sleeping.
- Mathematical truths because, although they seem very clear, others have been wrong in their proofs, and there may even be an evil genius deceiving us.
Thus, Descartes seems a skeptic, but skepticism is only provisional and methodological. After all, he realizes there is something he cannot doubt: he cannot doubt that he doubts and thinks. From this, he establishes his first truth: I think, therefore I am. This first truth is the model of certainty. Therefore, if we accept it because it is clear (clear and distinct), anything that comes our way, we will accept it as true. The first truth is also to admit the existence of the ego or thinking substance.
Ideas and the Existence of God
But what do we think? We think ideas, and ideas can be:
- Innate (the obvious).
- Adventitious (seem to come from external reality, e.g., a tree).
- Fictitious (fruit of the imagination, e.g., a siren).
Among the ideas, we have is the idea of God as a perfect, infinite, eternal being. Is this idea true? Descartes demonstrates the existence of God with three proofs:
- Epistemological proof: I have the innate idea of a perfect being, but it cannot come from me because I am imperfect. Therefore, there is a being who has placed it in me: God.
- Proof of causality: There is no doubt that I exist, but I cannot be my cause; I have not always existed, so I owe my existence to another being: God.
- Ontological proof: The essence of God (perfection) is inseparable from His existence (like the idea of a mountain and valley, or a triangle and 180 degrees). It is impossible to conceive of God as not being perfect, or else something would be missing, and He would not be perfect.
The Existence of the World
Finally, Descartes proves the existence of the world from God. God is perfect and, therefore, true and good. He cannot deceive me and make me believe a world exists (the doctrine of divine truth). We conclude that for Descartes, there are three realities or substances:
- The soul or thinking substance (first truth), characterized by freedom.
- The infinite substance or God, characterized by perfection and infinity.
- Extended substance or world, which Descartes explains in a mechanistic way (machine).