A Summary of Kant’s Key Philosophical Ideas
Kant’s Theory of Knowledge
1) Theory of Knowledge. Kant stated that we do not perceive atoms directly. Instead, we perceive aggregates of atoms within space and time. Space and time, according to Kant, are perceptions themselves. He distinguishes between two types of items:
- a) Empirical: These items function to identify the empirical world.
- b) Pure (Level): These items have a logical and empiricist role.
Space and time do not belong to either category. They are a power of the transcendental subject, residing not in the empirical world but in the mind. Space and time structure data, enabling concepts and categories, through imagination, to be applied to sensitive data. This process is how objects of knowledge are constructed. Space and time are pure forms of intuition, a preconception. They are not concepts or perceptions, but rather come from the subject’s ability to intuit, and they predate experience.
- Acting on space and time structures sensitive data.
- Imagination shapes this structure through synthesis.
- The schematic transcendental serves as a bridge.
- Concepts are then applied.
The transcendental schematic results from applying pure forms of intuition (space and time) to the imagination. Its function is to allow us to apply concepts to the synthesis conducted by the imagination. Concepts without intuitions are empty, and intuitions without concepts are blind.
Simplified Structure of Kant’s Critique of Reason
2) Simplified Structure of All the Criticism of Reason: The critique of pure reason is dedicated to:
- a) The critique of metaphysics as knowledge.
- b) Understanding how scientific knowledge is possible.
- c) Determining if metaphysics as knowledge is possible.
Types of Knowledge Trials
According to Kant, knowledge trials are of two types: synthetic and analytical.
A) Synthetic: These trials link a predicate to something not necessarily included in the subject. They are a posteriori, meaning they come from sensory experience. These trials provide contingent and particular knowledge. A posteriori synthetic judgments expand knowledge, but they are contingent and individual. You can imagine their opposite without producing contradictions.
B) Analytical: The predicate is necessarily included in the subject. They are a priori, not derived from sensory experience. A priori analytic judgments do not expand knowledge. You cannot imagine their opposite without producing contradictions. They provide universal and necessary knowledge.
To explain science, judgments must be constructive a priori synthetic judgments. These judgments extend knowledge and are universal and necessary. Mathematics are judgments of this kind, extending knowledge.
Transcendental Aesthetic
The transcendental aesthetic is constructed as a priori synthetic judgments of mathematics. These judgments are built from the application of pure concepts or categories, not the synthesis of imagination, but only at the schematic transcendental.
Pillars of Mathematics
The pillars of mathematics at the time of Kant were arithmetic and geometry:
Arithmetic: Kant argues that we cannot derive the concept of numbers from logic. A fundamental concept is unity. The generation of natural numbers addresses the notion of unity and the transaction amount. The foundation of arithmetic stems from the application of addition and the schematic transcendental unity, working in time.
Geometry: Mathematics does not deal with objects themselves but with how objects appear to us.
Transcendental Analytics
The analytical problem of transcendental analytics is constructed as a priori synthetic judgments of physics. For Kant, a fundamental issue in physics is the notion of causality. Causality is not a belief but a pure concept or category. It is a product of understanding and, like all concepts, is only an object of knowledge when applied to empirical phenomena. Symmetrical trials of physics are constructed from the application of pure concepts or categories to sensible intuitions.
Transcendental Dialectic
The problem of the transcendental dialectic is how metaphysics is constructed. For Kant, metaphysics is not knowledge. Metaphysics seeks to know reality itself, an area of the thinkable, the intelligible. Kant calls these transcendental ideas, which are not objects of knowledge but purely rational thinking. Their function is to link scientific knowledge in a conceptual system. They deal not with what exists but with what must exist.
Critique of Practical Reason
3) Critique of Practical Reason. In the critique of practical reason, Kant asks two questions:
- What can we do? What is the purpose of life?
- What can we expect? What is the future for mortal beings?
Material vs. Formal Ethics
There are key differences between material and formal ethics. Material ethics should not be confused with materialist ethics.
Material Ethics: Determined by a purpose. It is heteronomous because the order is given externally. Judgments are hypothetical: if… then…. These trials can be explained.
Formal Ethics: They have no purpose. They are autonomous because they are ethical without content, or whose sole content is the line of duty for duty’s sake. This duty is self-imposed and not contrary to reason. Trials are categories or constraints of the form: you… why? Because it is your duty. These judgments cannot be explained. They are unconditional because there is no moral act status.
Free Will
What is free will? In nature, we find sets of determining causes. However, free will is a will that can be caused by itself, outside of nature. If the human subject (transcendental) had no free will, there would be no moral act. Kant says that animals are not moral because they are subject to nature, but humans oscillate between moral and immoral because there is something in man not subject to nature: free will. For Kant, free will cannot be represented or known, but it can be thought, and that puts it in relation with the thing itself.
The Categorical Imperative
The categorical imperative is Kant’s formulation of the highest moral laws or mandates that the subject, in their free will, gives to themselves. It is a shape because it has no content and should not aim towards any goal. The term is significant: categorical imperative = imperative, categorical = contrary to the hypothetical. Categorical means it is a mandate that has to be met without conditions.
Criticism of the Categorical Imperative
The human being is heteronomous because they get language from parents. Parents have to interpret the child when she cries. Desire is also heteronomous, as it monopolizes any claim. So, when Kant speaks of the categorical imperative, that we must fulfill our duty by our free will, it is not fully achievable.