Kant’s Philosophy: A Critical Analysis of Reason
Transcendental Idealism
Kant’s transcendental idealism centers on a critical philosophy focused on reason. This critique, conducted by reason itself, has a practical purpose: to promote freedom and progress. His philosophy addresses four key questions:
- What can I know? (Critique of reason establishes the limits of knowledge.)
- What should I do? (Establish principles governing human behavior.)
- What may I hope for? (The ultimate meaning of human existence.)
- What is man? (Encompasses the previous three questions.)
These questions constitute what Kant terms “worldly philosophy,” distinct from academic philosophy’s focus on developing systems relating philosophical concepts.
The Theoretical Use of Reason
Metaphysics as a Problem
Reason determines the limits of knowledge. Can metaphysics exist as a science? Metaphysics differs from other sciences due to its lack of progress. Kant investigates whether this “battlefield” can be resolved, acknowledging that metaphysics is a natural human disposition and we are compelled to address its problems. Metaphysics hasn’t entered the path of science because it hasn’t considered its conditions of possibility. We must determine if metaphysics meets these conditions. Science is a set of judgments forming arguments. This raises the question: what kind of judgments constitute science? This necessitates classifying judgments:
- Analytic judgments: The predicate’s information is contained within the subject. They are necessary and true, based on the principle of contradiction, and are explanatory. (e.g., All triangles have three angles.)
- Synthetic judgments: The predicate adds information not found in the subject. They can be false, are not universal, and are not necessarily true. They extend knowledge.
Regarding experience:
- A priori judgments: Their truth is known without experience; they are universal and necessary.
- A posteriori judgments: Their truth requires experience; they are particular.
Kant’s classification parallels Hume’s types of knowledge. Kant’s originality lies in arguing for synthetic a priori judgments (e.g., The straight line is the shortest distance between two points) alongside analytic, synthetic a posteriori, and a priori judgments. Sciences comprise these judgments. Can metaphysics construct them? Having identified the types of scientific judgments, Kant investigates the conditions of human knowledge.
- Empirical conditions: Specific and unique to each act of knowledge; variable.
- Transcendental conditions: General and universal structures applied by the subject in every act of knowledge; a priori.
This constitutes Kant’s epistemological revolution: the subject actively shapes knowledge and is more important than the object.
Analysis of the Powers of Knowledge
Having established the conditions of knowledge, Kant analyzes the cognitive faculties:
- Transcendental Aesthetic (Sense): Knowledge is a synthesis of sensations from the object and a priori forms of sensibility.
- Transcendental Analytic (Intellect): Knowledge is a synthesis of sensations and categories of understanding (which can be legitimate or illegitimate). The concept of cause is central for Kant.
- Transcendental Dialectic (Reason): Reason makes illegitimate use of categories when dealing with metaphysics (dialectical use of reason). This explains why metaphysics can never be a science, resolving the problem of dogmatism.
The Practical Use of Reason
The practical use of reason addresses the second question of philosophy.
Kantian Formalism: The Categorical Imperative
Kant pioneered formal ethics, contrasting with previous material ethics (which posit an ultimate end for man). Formal ethics, without content, establishes the form moral actions must take. The moral value of an action depends on the motivation behind it. Actions are morally valid only when performed from duty (moral, not legal). Three types of actions relate to duty:
- Contrary to duty: Knowing the obligation, but doing the opposite.
- In accordance with duty: Performing the duty, but for reasons other than obligation.
- From duty: Fulfilling the obligation because it is one’s duty.
Kant’s ethics culminates in the Categorical Imperative, a rigorous principle without exceptions.