PHI-DSM-201 (Western Epistemology & Metaphysics): Unit 3: Theories of Knowledge

Semester: III | Credits: 4 | Full Marks: 100 (ESE=70/CCA=30)

Table of Contents

1. Rationalism
2. Empiricism
3. Kant's Critical Theory
4. Intuitionism

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Rationalism

**Rationalism** is the epistemological view that **reason** (intellect, *a priori* reasoning) is the chief source and ultimate test of knowledge. Sense experience is viewed as unreliable and potentially deceiving.

• Source of Knowledge: Innate Ideas or Intellectual Intuition.
• **Method:** Deduction and Mathematical reasoning.
• **Key Philosophers:** Descartes, Spinoza, Leibniz (The Continental Rationalists).
• Core Belief: At least some human knowledge is **a priori** (independent of experience), synthetic, and certain (e.g., metaphysical and mathematical truths).

Empiricism

**Empiricism** is the epistemological view that **sense experience** (*a posteriori* reasoning) is the chief source of knowledge. The mind is a blank slate (*tabula rasa*) at birth.

• Source of Knowledge: Sensation and Reflection (experience).
• **Method:** Induction and Scientific Observation.
• **Key Philosophers:** Locke, Berkeley, Hume (The British Empiricists).
• Core Belief: All genuine factual knowledge is derived from or validated by experience. Knowledge is mostly **a posteriori** (dependent on experience).

Kant's Critical Theory

Immanuel Kant's philosophy is often called the **Critical Theory** because it sought to mediate and reconcile the extreme claims of Rationalism and Empiricism. He proposed a **Copernican Revolution** in philosophy.

The Synthesis: "Thoughts without content are empty; intuitions without concepts are blind."

• **Role of Experience:** All knowledge *begins* with experience (agreeing with Empiricism).
• **Role of Reason:** Knowledge is not *derived* solely from experience; the mind contributes **a priori structures** (Concepts of the Understanding, or Categories like Substance, Causality, Unity) that organize sensory data (agreeing with Rationalism).
• **A Priori Synthetic Knowledge:** Kant showed that true, non-trivial knowledge (like mathematics and necessary laws of science) is possible because these laws are structured into the way the human mind *experiences* the world.

Intuitionism

**Intuitionism** is a theory of knowledge that holds that some truths, especially moral or mathematical ones, are known by **direct, non-inferential apprehension** (intuition), rather than through sensory observation or logical deduction.

• **Nature of Intuition:** It is immediate, non-sensory, and non-rational, offering direct insight into the nature of reality or moral facts.
• **Contrast:** Unlike rationalism (which often uses intuition to grasp axioms that are then deduced), Intuitionism emphasizes the immediate, emotional, or non-logical grasp of truth.
• **Application:** Often seen in **Ethical Intuitionism**, where fundamental moral duties or values are considered self-evident and known directly (e.g., G.E. Moore's idea that "Good" is a simple, unanalyzable property known by intuition).

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