Philosophy and its Major Branches: An Introduction

Philosophy and its Major Branches

An Introduction · Love of Wisdom · The Mother of All Disciplines

Sections

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Learning Objectives

1

Define philosophy from its Greek roots and recognise that it begins in aporia — the productive confusion that arises when we question what we take for granted

2

Recall key definitions offered by Socrates, Hobbes, Kant, Hegel, Marx, Russell and Wittgenstein, and notice how each frames philosophy differently

3

Explain why philosophy is called the “Queen of the Sciences” or “Mother of all Disciplines”

4

Distinguish the four major branches — Metaphysics, Epistemology, Axiology and Logic — and state the central questions each branch asks

5

See how the branches interlock: every field of knowledge ultimately rests on philosophical ground when its fundamental units are questioned

Tip: Philosophy is not a body of finished answers. It is the activity of clarifying thoughts by refusing to leave the “insignificant” unexamined. Keep that spirit as you move through each section.

What is Philosophy?

Philosophy, the word is derived from Greek philo which means love and sophia which means wisdom, so, literally speaking, philosophy is love for wisdom.

When someone hears of the word philosophy they imagine something really profound thought (or boring long chatter) about something really important, unique (or irrelevant and stupid :D ). To my understanding, philosophy lies in questioning the commonly perceived very insignificant things, things that are always taken for granted; such as, how many times you have called an action or a thing as truthful, false, right, wrong, good, or bad, normal, abnormal, beautiful, ugly, just, unjust, rational, irrational — but upon being asked how would you define truth? (or any of the other terms just listed), you are dazzled and lost in the abyss of aporia.

The aporia, that’s where the philosophy begins. Aporia is the state of productive puzzlement — the moment when the ordinary categories we rely on every day suddenly refuse to stand up under scrutiny. Philosophy does not begin with answers; it begins when the answers we thought we possessed dissolve.

✓ Every time you casually label something “true,” “just,” “beautiful,” or “rational,” you are already employing philosophical concepts. Philosophy simply refuses to leave those concepts unexamined.

✓ The “insignificant” is often the most significant. What we take for granted is precisely what shapes our lives, our institutions, and our sense of what is possible.

Wonder is the beginning of wisdom. — Socrates, from the dialogues with Theaetetus

In short: Philosophy is the disciplined refusal to treat the everyday as self-evident. It is the love of wisdom expressed as the courage to ask “What do we really mean when we say…?” and then to follow the question wherever it leads.

How Philosophers Have Defined It

Let’s first see how the philosophers have defined it. Notice that each definition is itself a philosophical act — it selects what counts as central and what can be left in the background.

Socrates (dialogues with Theaetetus): “Wonder is the beginning of wisdom.” Philosophy begins in the experience of not-knowing that refuses to stay silent.

From the dialogue Euthydemus: “Philosophy is the acquisition of knowledge.” Here the emphasis falls on the activity of coming to know, not on a finished system.

Thomas Hobbes (Leviathan): “Philosophy is the knowledge acquired by reasoning, from the manner of the generation of any thing, to the properties; or from the properties, to some possible way of generation of the same.” Philosophy as causal and generative reasoning.

Immanuel Kant (Critique of Pure Reason): “Philosophy is the science of the relation of all knowledge to the essential ends of human reason.” Philosophy as the critical mapping of knowledge onto the ultimate purposes of reason itself.

G.W.F. Hegel (Philosophy of Right): “Philosophy is its own time apprehended in thoughts.” Philosophy as the self-comprehension of a historical moment — not timeless abstraction, but the rational grasp of the present.

Karl Marx (Theses on Feuerbach): “The philosophers have only interpreted the world, in various ways; the point is to change it.” Philosophy as critique that must pass into transformative practice.

Bertrand Russell (A History of Western Philosophy): “Philosophy, as I shall understand the word, is something intermediate between Theology and Science… a No Man’s Land, exposed to attack from both sides.” Philosophy occupies the contested space where neither pure faith nor pure empirical method can settle every question.

The object of philosophy is the logical clarification of thoughts. Philosophy is not a theory but an activity. — Ludwig Wittgenstein (one of my personal favourites)

They refuse to treat philosophy as a static body of doctrine. Whether they stress wonder, reasoning, critical relation to the ends of reason, historical self-comprehension, transformative practice, or logical clarification, each insists that philosophy is an activity — a way of relating to the world and to our own thoughts — rather than a finished catalogue of truths.

Queen of the Sciences / Mother of All Disciplines

Philosophy is often called “Queen of the Sciences” or the “Mother of all Disciplines” because it birthed all disciplines that you know. Physics was formerly called “natural philosophy”; psychology, “Philosophy of the Mind”; Mathematics, Chemistry, Law, Medicine — you name it! All these fields started crawling through the lap of the mother philosophy and eventually grew up to live independently.

Foundational ground: Philosophy is the foundational, structural, and critical ground that provides all these fields a standing place. If one questions the fundamental units of any field, and keeps regressing in thought, what one would stumble upon would be philosophy.

✓ Law decides actions as just and unjust — but philosophy answers what “just” itself is (Jurisprudence / Philosophy of Law).

✓ Business Ethics, Medical Ethics, AI Ethics — all are applied ethical inquiries that rest on deeper axiological questions about value, duty, and the good.

✓ Defining what truth is itself, what reality is itself, what knowledge requires, what a valid argument is — these remain philosophical even when they appear inside other disciplines.

Special sciences

Work within established frameworks: they measure, experiment, calculate, legislate, diagnose. Their success depends on not constantly reopening every foundational question.

Philosophy

Keeps the frameworks themselves under review. When a science or profession asks “What counts as evidence?”, “What is a person?”, “What is justice?”, it is already doing philosophy.

Regression of questioning: Start with any practical claim — “This law is just,” “This theory is true,” “This action is ethical.” Keep asking “What does that mean?” and “On what grounds?” Eventually you leave the specialised science and enter the philosophical domain where the very concepts of justice, truth, and ethics are themselves the objects of inquiry.

Metaphysics — The Study of Reality

Metaphysics investigates the fundamental nature of reality, existence, and the very universe per se. It also looks beyond the physical world to understand the core make-up of “being.” It concerns itself with questions like: “What is real?”, “What is mind?”, “Does Free Will exist?”, “Does God exist?” and so on.

Etymology reminder: “Meta-physics” originally meant the books that came after the Physics in Aristotle’s corpus. Over time it came to name the inquiry into what lies beyond (or beneath) the merely physical description of the world.

Key territories inside metaphysics include:

✓ Ontology — the study of being as such: What kinds of things exist? What does it mean for something to be? Are there only particulars, or also universals, numbers, possibilities?

✓ Philosophy of Mind — What is consciousness? Is the mind identical with the brain, or something more? How do mental states relate to physical states?

✓ Free Will and Determinism — Are our actions free, or are they the inevitable outcome of prior causes? Can moral responsibility survive if determinism is true?

✓ Philosophy of Religion / Natural Theology — Does God (or gods) exist? What would count as evidence? What is the relation between divine attributes and the world we experience?

✓ Cosmology and the nature of time, space, and causality — Is the universe finite or infinite? Is time linear, cyclical, or something else? What is a cause?

Why it matters: Every science and every ordinary practice presupposes some picture of what is real. Metaphysics makes that picture explicit and subjects it to rational scrutiny. Without it, we risk treating contingent pictures of reality as if they were self-evident.

Discussion: When you say “X is real” or “X is just an illusion,” what criteria are you already using? Metaphysics is the attempt to bring those criteria into the open.

Epistemology — The Study of Knowledge

Epistemology is the theory of knowledge that focuses on how understanding works, what counts as genuine knowledge, and the limits of what can be understood. It asks questions like: “What is truth?”, “How do we know what we know?”, “Can we ever be completely certain of anything?”, “Should we be skeptics?” and so on.

From the Greek: epistēmē (knowledge) + logos (account, reason). Epistemology is the reasoned account of knowledge itself.

Central concerns and classic positions:

✓ The nature of knowledge — Traditionally analysed as justified true belief (though this analysis has been challenged). What must be added for a true belief to count as knowledge?

✓ Sources of knowledge — Rationalism (reason as primary), Empiricism (experience as primary), and various mixed or alternative accounts (including testimony, memory, and intuition).

✓ Skepticism — The challenge that we may not know what we think we know, or that certainty is impossible. Philosophy has repeatedly answered, refined, or lived with this challenge.

✓ Truth — Correspondence (truth as matching reality), Coherence (truth as systematic fit), Pragmatist and other theories. What does it mean for a claim to be true?

✓ Limits of knowledge — Are there things we cannot, in principle, know? How do we distinguish genuine limits from temporary ignorance?

Everyday stakes: Every time someone says “I know that…” or “You can’t be certain of…,” they are making an epistemological claim. Science, law, journalism, and ordinary conversation all depend on shared (or contested) standards of what counts as knowing.

Philosophy is the acquisition of knowledge. — From the dialogue Euthydemus

Axiology & Logic

Axiology — The Study of Values

Axiology examines what is right and wrong, good and bad, beautiful and ugly, and more, while building frameworks to evaluate human behaviour, justice, and responsibilities. It inquires into questions such as: “What makes an action right?”, “What is our duty to other people?”, “Is morality absolute?” and so on.

✓ Ethics (Moral Philosophy) — Normative ethics (what we ought to do), Metaethics (what moral language and properties are), Applied ethics (concrete domains such as medical, business, environmental, and AI ethics).

✓ Aesthetics — The study of beauty, art, taste, and the nature of aesthetic experience. What makes something beautiful or ugly? Is aesthetic value objective, subjective, or something else?

✓ Value theory more broadly — Political values (justice, liberty, equality), the good life, and the ranking or weighing of competing goods.

Why axiology matters: Law, politics, personal choice, and social criticism all rest on value judgments. Axiology does not invent those judgments; it subjects them to rational examination so that we know what we are committed to when we call something right, good, or beautiful.

Logic — The Study of Reason

Logic is the methodology of philosophy to study arguments, valid reasoning, syllogisms, and fallacies of thought. It is the tool by which philosophy tests its own claims and the claims of every other discipline.

✓ Formal logic — The study of valid inference forms (syllogisms, propositional and predicate logic, etc.), independent of particular subject-matter.

✓ Informal logic and critical thinking — The analysis of everyday arguments, rhetoric, and the many ways reasoning can go wrong (fallacies of relevance, ambiguity, presumption, and so on).

✓ Philosophy of logic — What is validity? What is a logical truth? Are there alternative logics? How does logic relate to language and thought?

Wittgenstein’s reminder: “The object of philosophy is the logical clarification of thoughts. Philosophy is not a theory but an activity.” Logic is not merely one branch among others; it is the activity through which philosophical thinking becomes clear and rigorous.

How the four branches interlock: Metaphysics asks what is real; Epistemology asks how (and whether) we can know it; Axiology asks what is valuable or obligatory within that reality; Logic supplies the standards by which arguments in all three domains are assessed. Question any of them deeply enough and you will find yourself in the others.

Discussion: If philosophy begins in aporia — the recognition that our ordinary concepts of truth, justice, reality, and beauty are not as clear as we assumed — which of the four branches do you find yourself entering first when you try to clarify them?

Knowledge Check

1. According to the notes, philosophy begins in:

A finished system of absolute truths The aporia that arises when we try to define the concepts we take for granted Empirical laboratory experiments The rejection of all wonder and questioning

2. Which of the following is Wittgenstein’s characterisation of philosophy?

“The philosophers have only interpreted the world… the point is to change it.” “Philosophy is its own time apprehended in thoughts.” “The object of philosophy is the logical clarification of thoughts. Philosophy is not a theory but an activity.” “Philosophy is the science of the relation of all knowledge to the essential ends of human reason.”

3. Metaphysics is best described as the study of:

Valid arguments and fallacies The fundamental nature of reality, existence, and being What counts as genuine knowledge and its limits Right and wrong, good and bad, beautiful and ugly

4. Philosophy is called the “Mother of all Disciplines” because:

It replaced all the special sciences It is the foundational ground to which questioning of any field’s basic units ultimately returns It is only interested in abstract speculation and never in practical matters It has no connection to physics, psychology, law, or ethics

Flashcards

Click a card to flip it.

Philosophy (etymology)

From Greek philo (love) + sophia (wisdom) — love of wisdom

Aporia

The productive puzzlement where philosophy begins — when taken-for-granted concepts dissolve under questioning

Metaphysics

Study of the fundamental nature of reality, existence, and being

Epistemology

Theory of knowledge: what counts as knowledge, how we know, and the limits of understanding

Axiology

Study of values — ethics (right/wrong, good/bad) and aesthetics (beautiful/ugly)

Logic

Study of valid reasoning, arguments, syllogisms, and fallacies — the methodology of philosophy

Mother of all Disciplines

Philosophy birthed the sciences; regressing on any field’s fundamentals returns us to philosophy

Wittgenstein on philosophy

Not a theory but an activity: the logical clarification of thoughts