Kant's Critique of Metaphysics: The Transcendental Dialectic

Kant's Critique of Metaphysics in the Transcendental Dialectic

In the Critique of Pure Reason, Immanuel Kant examines the higher faculty of knowledge: reason. He critiques metaphysics for attempting to provide factual knowledge beyond empirical experience (extra-empirical).

The Two Uses of Reason

• Logical Use: Focuses on the content of knowledge and the relationships between judgments (formal logic).
• Pure Use: Attempts to apply concepts to understand entities beyond sensory experience, such as God, the soul, and the world.

The logical use of reason seeks the ultimate condition of all knowledge—the unconditioned—without needing proof. This is acceptable as long as reason remains within formal boundaries. However, the pure use of reason seeks to know the noumenon (the thing-in-itself) without the aid of experience.

The Error of Metaphysics

The error of metaphysics lies in pretending to know objects that exceed the limits of possible experience. Kant identifies three dialectical inferences where reason mistakenly attributes reality to these ideas:

• Paralogism: An invalid argument regarding the soul as a substance. Kant argues the self can only be understood as a phenomenal reality.
• Antinomy: Errors regarding the world as a whole. Kant claims only the phenomenon is capable of objective reality.
• Ideal of Pure Reason: Regarding God and the ontological argument, which falsely maintains that existence is a property of the "most perfect" being.

Critique of Traditional Arguments

• Cosmological Argument: Based on the principle of causality; Kant maintains that science cannot determine where the causal chain must stop.
• Physico-theological Argument: Claims that everything tends toward a design; Kant argues we can only conclude there is order within the phenomenal world.

Conclusion

Pure reason cannot know objects beyond experience, but this does not render the study of metaphysics impossible. These concepts can be approached through practical reason, which allows us to think about these ideas as postulates rather than making definitive judgments about their existence.