Why this matters now
UPSC asks the thought of a named thinker, or supplies a quotation to interpret. Knowing one key idea per thinker — and the ethical school they represent — lets you frame answers with authority.
The three normative schools
Most thinkers map onto one of three approaches: virtue ethics (Aristotle — good character and the “golden mean”), deontology (Kant — duty and the categorical imperative), and consequentialism/utilitarianism (Bentham & Mill — the greatest happiness of the greatest number).
World philosophers
| Thinker | Core idea |
|---|---|
| Socrates | “Know thyself”; virtue is knowledge; the examined life |
| Aristotle | Virtue ethics; the golden mean; eudaimonia (flourishing) |
| Immanuel Kant | Deontology; categorical imperative; act only on universalisable maxims; treat people as ends |
| Bentham & J.S. Mill | Utilitarianism — the greatest happiness of the greatest number |
| John Rawls | Justice as fairness; the “veil of ignorance” |
| Lawrence Kohlberg | Stages of moral development (pre-conventional → conventional → post-conventional) |
Indian thinkers
| Thinker | Core idea |
|---|---|
| Gautama Buddha | The Middle Path; the Eightfold Path; compassion (karuna), non-violence |
| Kautilya (Chanakya) | The Arthashastra; the welfare of the people as the king’s duty; pragmatic statecraft |
| Mahatma Gandhi | Truth (satya), non-violence (ahimsa), trusteeship, sarvodaya, ends-means unity |
| Swami Vivekananda | Service to humanity as worship; strength and self-confidence |
| B.R. Ambedkar | Liberty, equality, fraternity; social justice and constitutional morality |
| Thiruvalluvar | The Tirukkural — virtue, wealth and love as guides to ethical living |
UPSC angle
Keep one crisp idea + one quote per thinker. Be able to apply a framework (Kant’s duty, Mill’s utility, Rawls’s veil, Gandhi’s ends-means) to a case study or quotation.
Frequently asked questions
What is Kant’s categorical imperative?
A core deontological principle: act only on a maxim you could will to be a universal law, and always treat people as ends in themselves, never merely as means.
What is Rawls’s veil of ignorance?
A thought experiment: design society’s rules without knowing your own position in it, so the rules are fair to all — the basis of “justice as fairness.”
What were Gandhi’s core ethical ideas?
Truth (satya), non-violence (ahimsa), trusteeship, sarvodaya (welfare of all) and the unity of ends and means.
What are Kohlberg’s stages of moral development?
Three levels — pre-conventional (reward/punishment), conventional (social approval/law) and post-conventional (universal ethical principles).