PHI-DSM-201 (Western Epistemology & Metaphysics): Unit 5: Metaphysical Categories

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

Table of Contents

1. Substance
2. Space and Time
3. Universals (The Problem of Universals)
4. Causality (David Hume)

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Substance

**Substance** is a core metaphysical category. It is defined as that which exists in itself and needs nothing else in which to exist, and is the underlying reality that possesses **attributes** or **properties**.

• **Descartes:** Proposed three substances: God (infinite), Mind (thinking, unextended), and Matter (extended, non-thinking).
• **Spinoza:** Argued that only **God** is Substance (since only God is truly self-caused and self-sufficient—Monism). Mind and Matter are merely two **Attributes** of this single Substance.
• **Locke:** Defined substance as an **unknown substratum** or "something I know not what" that holds all the perceived qualities together.
• **Hume:** Reduced substance to merely a **collection of ideas** connected by imagination, denying its objective metaphysical reality.

Space and Time

Space and Time are fundamental frameworks within which all experience takes place.

• **Newton/Classical View (Absolute):** Space and Time exist independently of the objects within them. They are infinite, fixed, and unchanging containers.
• **Leibniz (Relational):** Space and Time are not things, but merely systems of relations between objects and events. If there were no objects, there would be no space or time.
• **Kant (Transcendental Idealist):** Space and Time are **a priori forms of intuition**. They are not properties of things-in-themselves (*Noumena*), but are the necessary subjective lenses (*Phenomena*) through which the human mind organizes sensory experience.

Universals (The Problem of Universals)

**Universals** are those properties, features, or essences that can be instantiated by many particular things (e.g., *redness*, *horseness*, *justice*). The problem of universals asks: do universals exist, and if so, what is their nature and location?

1. Platonic Realism (Extreme Realism): Universals exist **objectively** and **prior to** (or separate from) particulars (e.g., the Form of Justice exists in the World of Forms).
2. Aristotelian Realism (Moderate Realism): Universals exist **objectively** but **in** (immanent to) the particulars, not separate from them.
3. Nominalism: Universals do **not** exist. They are merely names, concepts, or labels we use to group similar things together. Only particulars are real.

Causality (David Hume)

David Hume, through his Empiricist lens, delivered a severe challenge to the traditional metaphysical category of **Causality** (the necessary connection between a cause and its effect).

Hume's Analysis

Hume asked: where is the **necessary connection** perceived? He found only three factors in any causal relation (A causes B):

1. **Contiguity:** A and B occur close in space and time.
2. **Priority:** A occurs immediately before B.
3. **Constant Conjunction:** A has always been followed by B in past experience.

Hume concluded that the idea of **Necessary Connection** is not derived from any objective impression in the external world. Instead, it is merely a **habit of mind** (or psychological expectation) projected onto the world, derived from the frequent observation of constant conjunction.

Conclusion: Causality is not a metaphysical necessity but a **psychological necessity** based on repeated custom. This conclusion led to Kant's Critical philosophy, which sought to save causality as an *a priori* condition of experience.

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