Reading Pathways

The course is designed to be read straight through, in order — that is how the story of influence builds. But not everyone has time for all fifty-five lessons, and some readers come with a focused interest. This appendix offers alternative routes: a Fast Track through the indispensable spine of the story, and five thematic pathways that follow a single thread from the Greeks to the present. Each lesson still assumes the ones before it in the full sequence, so a pathway will occasionally reference an idea introduced in a lesson you have skipped; the cross-references in each lesson, and the Glossary and Who Is Who, are there to fill the gaps.

The Fast Track (20 lessons)

If you read only twenty lessons, read these. They contain the load-bearing arches of the whole conversation — the thinkers without whom almost nothing later makes sense — and they can be read as a continuous, if brisk, history.

1. Lesson 1 — From Myth to Logos: the birth of philosophy
2. Lesson 3 — The Sophists and Socrates: the turn to the human
3. Lesson 4 — Plato I: Knowledge and the Forms
4. Lesson 5 — Plato II: The Republic
5. Lesson 6 — Aristotle I: Logic and Nature
6. Lesson 7 — Aristotle II: Ethics and Politics
7. Lesson 8 — The Stoics and the Cynics: philosophy as a way of life
8. Lesson 11 — Augustine: the inheritance carried into Christianity
9. Lesson 17 — Thomas Aquinas: the grand synthesis of faith and reason
10. Lesson 19 — The Renaissance and the Skeptical Crisis
11. Lesson 20 — The Scientific Revolution
12. Lesson 21 — Descartes: rebuilding knowledge from the foundations
13. Lesson 26 — Hume: the limits of reason
14. Lesson 29 — Kant I: The Critique of Pure Reason
15. Lesson 30 — Kant II: Morality and Beauty
16. Lesson 33 — Marx: the point is to change it
17. Lesson 35 — Nietzsche: the revaluation of all values
18. Lesson 45 — Existentialism: Sartre, Beauvoir, and Camus
19. Lesson 49 — Rawls: the rebirth of political philosophy
20. Lesson 51 — Minds, Brains, and Machines: from Turing to AI

Finish with the Lesson 55 Capstone, which walks all six threads end-to-end and points you onward.

Ethics: How Should We Live?

From the first question Socrates pressed on the streets of Athens to the expanding circle of contemporary moral concern.

• Lesson 3 — Socrates: the examined life, and "how ought one to live?"
• Lesson 7 — Aristotle: virtue, the mean, and eudaimonia
• Lesson 8 — The Stoics and Lesson 9 — Epicureans and Skeptics: ethics as therapy
• Lesson 30 — Kant: the categorical imperative and the dignity of persons
• Lesson 34 — Mill: utilitarianism and the greatest happiness
• Lesson 42 — The Somerville Quartet: the revival of virtue ethics
• Lesson 52 — Contemporary Ethics: Singer, Parfit, Williams, and the metaethical map
• Lesson 53 — Justice Expanded: care ethics and the widening circle

Mind and Knowledge: What Can We Know, and What Are We?

The theory of knowledge and the philosophy of mind, from Plato's Forms to the question of whether a machine can think.

• Lesson 4 — Plato: knowledge versus opinion; the Forms
• Lesson 6 — Aristotle: the soul as the form of the body; logic
• Lesson 21 — Descartes: the cogito and mind–body dualism
• Lesson 25 — Locke and Berkeley: the way of ideas
• Lesson 26 — Hume: impressions, induction, and the bundle self
• Lesson 29 — Kant: the mind shapes experience
• Lesson 41 — Quine, Ryle, and Austin: the web of belief and the Gettier problem
• Lesson 43 — Husserl and Phenomenology: describing lived experience
• Lesson 50 — Kripke, Putnam, and Lewis: necessity, meaning, and possible worlds
• Lesson 51 — Minds, Brains, and Machines: consciousness and AI
• Lesson 54 — Knowing in the Digital Age: testimony, trust, and misinformation

Politics and Justice: How Should We Live Together?

The just society, from Plato's ideal city through the social contract to global justice.

• Lesson 5 — Plato's Republic: justice in the soul and the city
• Lesson 7 — Aristotle's Politics: the political animal
• Lesson 17 — Aquinas: natural law
• Lesson 22 — Hobbes: the social contract and the Leviathan
• Lesson 25 — Locke: natural rights and consent
• Lesson 27 — Rousseau: the general will
• Lesson 28 — Burke, Paine, and Wollstonecraft: the Revolution, and the birth of left and right
• Lesson 33 — Marx: class, ideology, and revolution
• Lesson 34 — Mill: liberty and the harm principle
• Lesson 49 — Rawls: justice as fairness
• Lesson 53 — Justice Expanded: feminism, race, and global justice

Faith and Reason: Can They Live Together?

The longest-running negotiation in the course, from the first critique of the gods to the modern philosophy of religion.

• Lesson 1 — Xenophanes: the first critique of gods made in human image
• Lesson 11 — Augustine: faith seeking understanding
• Lesson 12 — Boethius, Eriugena, and Anselm: the ontological argument
• Lesson 13 — The House of Wisdom and Lesson 14 — The Incoherence Debate: philosophy and revelation in Islam
• Lesson 15 — Maimonides: negative theology
• Lesson 17 — Aquinas: the Five Ways and the grand synthesis
• Lesson 24 — Leibniz and Pascal: theodicy and the wager
• Lesson 26 — Hume: "Of Miracles" and the argument from design
• Lesson 29 — Kant: the demolition of the proofs of God
• Lesson 35 — Nietzsche: the death of God
• Lesson 50 — Kripke, Putnam, and Lewis: the revival of the philosophy of religion

The Women of the Conversation

A history of philosophy honest about its record must also recover the women the tradition long wrote out. This route follows them through the course — thinkers in their own right, and the philosophers of women's equality.

• Lesson 10 — Hypatia of Alexandria: the murdered Neoplatonist
• Lesson 19 — Christine de Pizan: the first sustained defense of women
• Lesson 21 — Princess Elisabeth of Bohemia: the interaction objection to Descartes
• Lesson 24 — Anne Conway and Margaret Cavendish: the system-builders
• Lesson 27 — Émilie du Châtelet: Newton's translator and critic
• Lesson 28 — Wollstonecraft and Gouges: the rights of woman
• Lesson 34 — Harriet Taylor Mill: the equality of the sexes
• Lesson 42 — The Somerville Quartet: Anscombe, Foot, Murdoch, and Midgley
• Lesson 43 — Edith Stein: the phenomenology of empathy
• Lesson 45 — Simone de Beauvoir: The Second Sex
• Lesson 46 — Arendt and Weil: thinking in dark times
• Lesson 53 — Justice Expanded: the feminist philosophers and beyond