Descartes’ Rationalism and the Existence of God
Argument of Causality
Applied to the Idea of God
The idea of God as an objective reality requires a proportionate cause. The idea of infinity requires an infinite cause, which can only be God. Therefore, God exists.
Applied to the Self
I exist, but that requires a reason. That reason cannot be found within myself. Therefore, I was caused by another being, which was either caused or uncaused. This chain of causality ultimately leads to a being that is not caused by anyone, i.e., God. Therefore, God exists.
Descartes’ Reasoning
If God exists and is infinitely perfect, then God is infinitely good. If God is infinitely good, then God cannot be deceiving me. Moreover, if God is infinitely powerful, then no evil genius can disrupt God’s work. Therefore, the external world, which seemed to exist but whose existence was uncertain, really exists!
Substance: Descartes vs. Spinoza
Descartes distinguishes between:
- The infinite substance (God)
- Finite substances (bodies and souls)
Within finite substances, he distinguishes between:
- The world of necessity (res extensa, the extended thing, or body)
- The world of freedom (res cogitans, the thinking thing, or soul)
Spinoza argues that this separation is inconsistent with the true definition of substance and is the result of the prejudice that humans are beyond the determinism of nature and act freely towards specific ends. Spinoza rejects the existence of final causes.
Rationalism
What is Epistemological Rationalism?
Epistemological rationalism, as discussed here, refers to a philosophical current of the 17th and 18th centuries, represented by Descartes, Spinoza, Malebranche, and Leibniz. It posits that all human knowledge arises from innate ideas and principles of reason. This contrasts with empiricism, which states that all knowledge arises from experience.
The Cogito: I Think, Therefore I Am
Descartes’ famous statement, “Cogito, ergo sum” (“I think, therefore I am”), discards any mental act and content: seeing, hearing, thinking, feeling pain, judging, reasoning, doubting, etc. It suggests that each thought grasps the self as the subject of that thought. This provides a first truth and a first certainty, serving as the prototype for all truth and absolute certainty. It also provides the criterion for judging truth and certainty based on clear and distinct perception, or evidence.
- Clarity: Immediate presence of the object to the intellect.
- Distinctness: Seeing what belongs to an idea and distinguishing it from what belongs to other ideas.
From the Cogito to God and the World
Descartes uses three arguments to demonstrate the existence of God:
- Ontological Argument: If God is omniperfect, God cannot lack the most important perfection, which is existence. Therefore, God exists.
(The remaining arguments were not included in the provided text.)