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Rationalism and Cartesian Philosophy: Core Principles

Philosophy and ethics2.45 KB

Rationalism: Core Principles

1. Definition

Rationalism is a philosophical movement originating in the 17th century, which argues that the primary source of knowledge is reason.

2. Key Features

  • Considers reason as the only valid source of knowledge.
  • Underestimates sensory knowledge.
  • Knowledge functions deductively.
  • Asserts the existence of innate ideas (ideas present at birth).
  • Aims to create a universal science based on mathematical methods and philosophical roots.
  • Prioritizes intellectual intuition to capture concepts clearly and distinctly.
  • Advocates for world rationality, allowing for a logical explanation of reality.
  • Posits that rationality implies regularity, where events occur mechanically and consistently.

René Descartes: Philosophy and Method

1. The Cartesian Method

Descartes devised a method to avoid errors and ensure that reason remains on the correct path.

Methodological Steps

  1. Evidence: Do not accept anything that does not manifest itself clearly and distinctly to the mind.
  2. Analysis: Break complex problems into smaller, manageable parts.
  3. Synthesis: Solve problems systematically, starting from the simplest and moving to the most complex.
  4. Enumeration: Review the entire process to ensure nothing has been overlooked.

2. Methodical Doubt

Descartes applied doubt to establish a foundation of certainty:

  • Senses: Because senses can fail, they cannot provide absolute security.
  • External Reality: One might be dreaming, making external perception unreliable.
  • Reasoning: An "evil genius" could deceive the mind, making even logical truths suspect.

The only certainty is the act of doubting itself. To doubt is to think, and if I think, I exist (Cogito, ergo sum). Therefore, my thoughts are the only immediate reality.

3. Substance

Descartes categorized substance into two types:

  • Infinite Substance: God.
  • Finite Substance:
    • Res cogitans: The thinking self (the mind).
    • Res extensa: The physical world, understood as an extended substance that can be measured and quantified.

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