In the Western tradition, the word “philosophy” comes from two Greek words: “philos” meaning love, and “sophia” meaning wisdom. So, etymologically, philosophy means “love of wisdom”. The Greek thinker Pythagoras was the first to call himself a philosopher, that is, a lover of wisdom, because he believed that only God is wise; man can only seek wisdom. Plato and Aristotle developed this idea further. For them, the philosopher is one who is constantly engaged in the pursuit of truth, beauty and goodness.

In the Indian tradition, the equivalent term is “darshana”. It is derived from the Sanskrit root “drish” which means “to see”. So “darshana” means seeing, vision or direct realisation. According to Indian thinkers, philosophy is not merely an intellectual analysis but a direct experience of reality. Through long study, meditation and self-discipline, the philosopher attains a clear vision of truth.

Thus the Western and Indian etymologies emphasise two different but complementary aspects of philosophy. The Greek word stresses the intellectual aspect — love of wisdom through reason. The Sanskrit word stresses the experiential aspect — direct vision of truth. Both together give us a complete picture of philosophy as both a rational inquiry and a way of life.

(i) Plato: Plato defined philosophy as “the knowledge of the eternal nature of things”. For him, the world of sense is full of changing appearances and gives only opinion. Real knowledge is the knowledge of the eternal Forms or Ideas, and this is what philosophy gives us.

(ii) Aristotle: Aristotle defined philosophy as “the science which investigates the first principles and causes of all things”. Particular sciences study particular branches of nature, but philosophy is the most general science which goes back to the original principles, original causes and ultimate purposes that lie behind every thing.

(iii) Descartes: Rene Descartes, the father of modern philosophy, defined philosophy as the study of wisdom by which we may live well. He compared philosophy to a tree whose roots are metaphysics, whose trunk is physics and whose branches are the other sciences. So for him philosophy is a unified system of true principles.

(iv) Kant: Immanuel Kant defined philosophy as the science of the limits of human reason. In his “Critique of Pure Reason” he showed that we cannot have knowledge of things-in-themselves; we know only things as they appear to us. So philosophy must critically examine the powers and limits of reason itself.

(v) Russell: Bertrand Russell defined philosophy as “the criticism of knowledge”. For him, philosophy is a no-man’s land between science and religion. Its main task is to question and examine the assumptions of common sense, science and religion, and so to clarify our knowledge.

Other important definitions are those of Hegel, who called philosophy the rational study of things, and Whitehead, who described it as the attempt to build a coherent, logical and necessary system of general ideas in terms of which every element of our experience can be interpreted. Together these definitions show that Western philosophy is essentially a rational and critical inquiry into the nature of reality, knowledge and value.

(i) Vyasa: The sage Vyasa, traditionally regarded as the compiler of the Vedas and the author of the Brahma Sutras, held that the highest philosophy is the knowledge of the self (atma-jnana). According to him, all other knowledge is meaningful only when it leads us to know our own real nature.

(ii) Shankaracharya: Adi Shankara, the great exponent of Advaita Vedanta, defined true philosophy as the knowledge of Brahman (Brahma-jnana). According to him, the world of plurality is mere appearance (maya); the only ultimate reality is Brahman, the absolute pure consciousness, and this Brahman is identical with the inner self (atman). Realisation of this identity is the highest aim of philosophy.

(iii) Manu and other Dharmashastra writers: Indian Dharmashastras described philosophy as the science by which one understands the right path of life and attains the highest good (moksha).

(iv) Sarvapalli Radhakrishnan: The modern Indian philosopher Radhakrishnan defined philosophy as “a logical inquiry into the nature of reality”. For him philosophy combines reason with intuition. It is rational and yet open to spiritual experience.

(v) Other Indian schools: The Nyaya and Vaisheshika schools described philosophy as the science of right knowledge through proper means (pramana). The Yoga school called philosophy the systematic discipline by which the mind is purified and ultimate truth is realised. Buddhism and Jainism also treated philosophy as the path to liberation.

In all these Indian definitions, the word “darshana” (vision) plays a central role. Indian philosophy is not satisfied with mere theory; it seeks the direct seeing of reality and the practical liberation of the soul.

(i) Rational: Philosophy is rational in nature. It depends on reason rather than on blind faith, authority or tradition. The philosopher accepts a view only if it is supported by valid arguments. Reason is the chief instrument of philosophy.

(ii) Critical: Philosophy is critical because it questions every assumption. It does not accept anything just because it is popular or old. It examines the foundations of common sense, science, religion and morality. Bertrand Russell rightly called philosophy “the criticism of knowledge”.

(iii) Comprehensive: Philosophy is comprehensive because it views the world as a whole. While each science studies one part of reality — physics studies matter, biology studies life, psychology studies mind — philosophy tries to integrate all these into a single coherent picture.

(iv) Speculative: Philosophy is speculative because it goes beyond observable facts. It speculates about ultimate questions such as the existence of God, the nature of soul, freedom of will and the purpose of the universe. These cannot be settled by experiment, so philosophy uses reasoned speculation.

(v) Normative: Philosophy is normative because it lays down ideals or norms. Ethics tells us what is right; aesthetics tells us what is beautiful; logic tells us what is valid reasoning. So philosophy is not only a description of the world but also a guide for human life.

(vi) Synoptic and synthetic: Philosophy aims at a synoptic vision and a synthetic view of reality, in which the findings of all the sciences and the insights of religion and art are brought together into a unified whole.

Thus the nature of philosophy is many-sided. It is at once a rational inquiry, a critical examination, a comprehensive view, a speculative search and a normative guide.

(i) Metaphysics: This is the most fundamental branch of philosophy. It deals with the ultimate nature of reality. Metaphysics has two divisions: (a) Ontology, which deals with the nature of being or existence, and (b) Cosmology, which deals with the origin, structure and order of the universe. Questions like “Is reality one or many?”, “Is the universe material or spiritual?” and “Does God exist?” belong to metaphysics.

(ii) Epistemology: This is the theory of knowledge. The word comes from the Greek “episteme” (knowledge) and “logos” (study). It enquires into the origin, nature, sources, validity and limits of knowledge. It asks “What is knowledge?”, “How do we know?” and “What is truth?”.

(iii) Axiology: This is the theory of values. It comes from the Greek “axios” (value) and “logos” (study). It is divided into (a) Ethics, the science of moral values, which deals with right and wrong conduct, and (b) Aesthetics, the science of the values of beauty, which deals with art and beauty.

(iv) Logic: Logic is the branch of philosophy which deals with the principles of valid reasoning and inference. It teaches us the difference between correct and incorrect arguments. It includes both deductive and inductive logic.

(v) Aesthetics: Though included in axiology, aesthetics is sometimes treated as a separate branch. It deals with the nature of beauty, art, taste and aesthetic experience.

(vi) Sub-branches: In modern times many sub-branches have developed. These include Philosophy of Mind, which studies the nature of mind and consciousness; Philosophy of Language, which studies the nature, meaning and use of language; Philosophy of Religion, which studies the rational basis of religious beliefs; Philosophy of Science, which studies the nature, methods and limits of science; Social and Political Philosophy; and Philosophy of History.

The scope of philosophy is therefore extremely wide. It covers reality (metaphysics), knowledge (epistemology), values (ethics, aesthetics) and reasoning (logic), and through its sub-branches it touches every important field of human concern.

(i) Rational analysis: The philosopher analyses concepts, beliefs and arguments by means of reason. He breaks down complex ideas into simpler ones and examines them critically. This is the basic method of philosophy.

(ii) Dialectical method: This method proceeds through the conflict of opposite ideas. In Socrates and Plato it appears as the question-and-answer dialogue, in which truth emerges through the criticism of one view by another. In Hegel and Marx, it takes the form of thesis, antithesis and synthesis.

(iii) Speculative method: Here the philosopher uses pure reason to construct a comprehensive system about reality, going beyond what experience directly shows. Plato, Spinoza, Leibniz, Hegel and the Vedantins followed this method.

(iv) Analytic method: This is the method of breaking down complex statements and concepts into their simpler elements in order to clarify their meaning. It is the leading method of modern Anglo-American philosophy. G. E. Moore, Russell, Wittgenstein and the logical positivists used this method.

(v) Phenomenological method: Founded by Edmund Husserl, this method describes the contents of consciousness exactly as they appear, without any pre-judgement about their cause or reality. It tries to study experience in its purity.

(vi) Intuitive method: Especially in Indian philosophy, intuition (anubhava, sakshatkara) is regarded as a method of attaining direct insight into reality. After long rational analysis, the philosopher rises to a direct vision of truth.

(vii) Transcendental method: Used by Kant, this method asks for the necessary conditions which make experience and knowledge possible.

By using these methods together, philosophy is able to handle problems that go beyond the scope of empirical science.

(i) Comprehensive world-view: Philosophy gives us a unified and comprehensive view of the universe. While the sciences study only fragments of reality, philosophy puts these fragments together and provides a complete picture of the world. This helps us to understand our place in it.

(ii) Foundation of all sciences: Philosophy is the mother of all sciences. The fundamental concepts and principles of science — such as cause, substance, law, truth, evidence — are clarified by philosophy. Without philosophical foundations, science loses its direction.

(iii) Development of reasoning: Philosophy trains us in clear thinking, valid reasoning and critical examination. Through the study of logic and analysis, philosophy sharpens the mind and removes confusion. This power of reasoning is useful in every walk of life.

(iv) Moral guidance: Through ethics, philosophy lays down ideals of right conduct, justice, duty and the highest good. It helps us in solving the moral problems of personal and social life.

(v) Aesthetic refinement: Through aesthetics, philosophy cultivates our sense of beauty and taste. It enriches our appreciation of art, music, literature and nature.

(vi) Spiritual upliftment: Especially in Indian thought, philosophy aims at liberation (moksha) from ignorance and suffering. It helps the person to attain inner peace, self-control and spiritual realisation.

(vii) Social and political guidance: Social and political philosophy provides ideals for the organisation of society — democracy, justice, freedom, equality. Such ideals have shaped the modern world.

(viii) Resolution of doubts: Philosophy helps us to face the deep doubts of life — about death, suffering, freedom, God — by offering reasoned answers and broader perspectives.

So philosophy is not a useless luxury. It is a necessary discipline that gives meaning, direction and depth to the whole of human life.

Similarities: Both philosophy and science aim at knowledge of truth. Both use reason and start from experience. Both try to give a systematic account of their subject matter. Historically, science was a part of philosophy and is still its child.

Differences:

(i) Scope: Science deals with a particular department of nature — physics deals with matter, biology with life, psychology with mind. Philosophy deals with the universe as a whole. So the scope of philosophy is much wider.

(ii) Subject matter: Science gives us knowledge of phenomena, that is, things as they appear. Philosophy goes further and asks about the reality behind the phenomena.

(iii) Method: Science uses the empirical and inductive method, based on observation and experiment. Philosophy uses many methods — empirical, rational, speculative, deductive, inductive, dialectical, analytic.

(iv) Assumptions: Science accepts certain basic assumptions (such as the uniformity of nature, the law of causation) without question. Philosophy questions these very assumptions and tries to justify them.

(v) Facts and values: Science is concerned only with facts; it is value-neutral. Philosophy is concerned with facts as well as with values — moral, aesthetic, religious.

(vi) Aim: The aim of science is to describe and explain particular phenomena. The aim of philosophy is to give a comprehensive vision of reality and to guide human life.

So while science and philosophy work hand in hand, philosophy is broader, deeper and more fundamental than any particular science.

Similarities: Both philosophy and religion deal with the deepest questions of life — the existence of God, the nature of the soul, the meaning of suffering and the goal of human life. Both aim at the highest good and at human liberation. In Indian tradition especially, philosophy and religion are inseparable.

Differences:

(i) Basis: Religion is based on faith, revelation and authority of scripture. Philosophy is based on reason and free inquiry.

(ii) Method: Religion uses devotion, prayer, worship, ritual and revelation. Philosophy uses reason, analysis, criticism and argument.

(iii) Attitude: Religion accepts its central beliefs without doubt. Philosophy doubts everything and accepts only what reason can justify.

(iv) Form: Religion is institutional; it has churches, temples, priests, rituals and communities. Philosophy is individual and intellectual; it is the work of solitary thinkers.

(v) Aim: The aim of religion is salvation through devotion and faith. The aim of philosophy is the rational understanding of reality, though in Indian thought it also leads to liberation.

(vi) Emotional and intellectual: Religion appeals primarily to emotion and feeling. Philosophy appeals primarily to intellect and reason.

In spite of these differences, philosophy and religion need each other. Religion without philosophy may become blind faith and superstition. Philosophy without religion may become dry intellectualism. A healthy life needs both.

(i) Ancient philosophy (6th century BC to 5th century AD): This begins with the Pre-Socratic thinkers of Greece — Thales, Anaximander, Heraclitus, Pythagoras — who asked about the ultimate stuff of the universe. The classical period of Socrates, Plato and Aristotle laid the foundations of Western philosophy. Socrates introduced the dialectical method; Plato developed the theory of Ideas; Aristotle systematised logic, metaphysics, ethics and politics. Later Hellenistic schools — Stoicism, Epicureanism, Scepticism, Neoplatonism — explored ethics and the good life.

(ii) Medieval philosophy (5th to 15th century AD): This was dominated by Christian thought. Saint Augustine combined Platonism with Christianity. Saint Thomas Aquinas combined Aristotelianism with Christian theology. The chief problem was the relation of faith and reason. Islamic philosophers like Al-Farabi, Ibn Sina (Avicenna) and Ibn Rushd (Averroes) made important contributions during this period.

(iii) Modern philosophy (16th to 19th century): This began with Descartes, the father of modern philosophy. The rationalists — Descartes, Spinoza, Leibniz — emphasised reason. The empiricists — Locke, Berkeley, Hume — emphasised experience. Kant produced a great synthesis in his “Critique of Pure Reason”. German Idealism in Fichte, Schelling and Hegel pushed reason to its limits. The 19th century also saw Marx, Kierkegaard, Nietzsche and others who reacted against pure system-building.

(iv) Contemporary philosophy (20th and 21st century): This is divided into two main streams. The analytic tradition (Russell, Moore, Wittgenstein, the logical positivists, Quine) emphasised logical analysis of language. The continental tradition (Husserl, Heidegger, Sartre, Merleau-Ponty, Foucault, Derrida) developed phenomenology, existentialism, hermeneutics and post-structuralism. Today philosophy continues to address new issues raised by science, technology, ethics, politics and culture.

Thus Western philosophy has continually grown and renewed itself, moving from cosmological questions to questions of mind, language and value.

(i) Orthodox schools (Astika): These accept the authority of the Vedas. They are six in number: (a) Nyaya, founded by Gautama, dealing with logic and epistemology; (b) Vaisheshika, founded by Kanada, dealing with categories of reality and atomism; (c) Samkhya, founded by Kapila, dealing with the dualism of Purusha (consciousness) and Prakriti (matter); (d) Yoga, founded by Patanjali, dealing with the discipline of body and mind for the realisation of the self; (e) Mimamsa, founded by Jaimini, dealing with the interpretation of the Vedic rituals and dharma; and (f) Vedanta, based on the Upanishads, the Brahma-sutras and the Bhagavad Gita, dealing with the knowledge of Brahman.

(ii) Heterodox schools (Nastika): These do not accept the authority of the Vedas. They are three in number: (a) Charvaka or Lokayata, the materialist school which accepts only perception as the source of knowledge and denies God, soul and after-life; (b) Buddhism, founded by Gautama Buddha, which teaches the four noble truths and the eightfold path; and (c) Jainism, taught by Mahavira, which teaches non-violence, the doctrine of karma and the path of right faith, knowledge and conduct.

All these schools, in spite of their differences, are concerned with the same basic questions of bondage, suffering and liberation. They show the depth and variety of Indian philosophical thought.

Common ground: All three aim at truth. Science seeks the truth about the natural world. Religion seeks the truth about God and salvation. Philosophy seeks the truth about reality, knowledge and values. All three help man to understand the world and to live a meaningful life.

Differences:

(i) Method: Science uses observation, experiment and induction. Religion uses faith, revelation and devotion. Philosophy uses reason, analysis and criticism.

(ii) Scope: Science deals with a part of nature. Religion deals with the relation of man to God. Philosophy deals with the universe as a whole.

(iii) Approach: Science is descriptive. Religion is prescriptive (it tells what to believe and to do). Philosophy is critical and evaluative.

(iv) Result: Science gives us knowledge of facts. Religion gives us faith and devotion. Philosophy gives us understanding and wisdom.

Need for all three: Russell rightly said that philosophy is “a no-man’s land between science and religion”. Philosophy uses the rationality of science but goes beyond it to deal with ultimate questions; it shares the ultimate concerns of religion but uses reason instead of faith. Each of the three needs the others. Religion without philosophy becomes blind faith; science without philosophy becomes narrow technology; philosophy without science and religion becomes mere abstraction. Together, they give man a balanced view of life and reality.