René Descartes: Method, Substance, and the Existence of God

Posted on Aug 2, 2024 in Philosophy and ethics

The Cartesian Method

Descartes’s method, known as the Cartesian Method, is a set of rules designed to achieve certainty in knowledge. The four rules are:

  1. Evidence: Accept only what is clearly and distinctly perceived.
  2. Analysis: Break down complex problems into simpler ones.
  3. Synthesis: Deduce complex truths from simpler ones.
  4. Enumeration: Review the steps to ensure nothing has been omitted.

Substance

Descartes defines substance as”that which exists in such a way that it needs nothing else to exist” He identifies three types of substance:

  1. Infinite Substance: God, who is perfect and self-sufficient.
  2. Thinking Substance (Res Cogitans): The mind, which is characterized by thought.
  3. Extended Substance (Res Extensa): Matter, which is characterized by extension.

The Existence of God

Descartes argues for the existence of God using three arguments:

  1. The Argument from Chance: The idea of an infinite being cannot have come from a finite being, so it must have been caused by an infinite being (God).
  2. The Argument from the Cause of My Being: I have the idea of a perfect being, but I am not perfect. Therefore, the cause of my idea must be a perfect being (God).
  3. The Ontological Argument: The idea of a perfect being includes the idea of existence. Therefore, a perfect being must exist.

Moral Provisional

While Descartes doubted all other beliefs, he recognized the need for moral guidance in everyday life. He proposed a provisional morality based on three rules:

  1. Obey the laws and customs of your country.
  2. Be firm in your actions, even if you make mistakes.
  3. Control your desires rather than trying to change the world.

Conclusion

Descartes’s philosophy is characterized by its emphasis on reason and the search for certainty. His method, theory of substance, and arguments for the existence of God have had a profound influence on Western thought.