Book summary
The Methods of Ethics summary
- 7 min read
- 10 key ideas
- Audio soon
Sidgwick tests three rival ways of deciding what you ought to do and finds a conflict he cannot fully settle.
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The Methods of Ethics at a glance
Summary: 7 min to read
- Reading time
- About 13 h 30 min10 h 45 min fast, 16 h 5 min slow
- Length
- 193,100 words
- Library level
- Challenging long sentences, a rich vocabulary
- First published
- 1874by Henry Sidgwick
Reading time at 238 words a minute (fast 300, slow 200). How long the classics take to read · Updated
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The Methods of Ethics in short
Sidgwick's book is a survey of the ways we reason about what to do. He shows that our thinking draws on three methods: Egoism, Intuitionism, and Utilitarianism. He tests each in turn, asking what it assumes and how far it can be made exact.
What The Methods of Ethics is about
What should you do when your own happiness points one way and your duty points another? Henry Sidgwick spent his career on that question, and The Methods of Ethics, first published in 1874, is the most careful attempt in English to answer it.
Sidgwick does not hand you a new moral system. He finds three ways people reason about what they ought to do. One aims at your own greatest happiness. One follows rules of duty that bind without regard to results. One aims at the happiness of everyone. He pulls them apart so each can be tested on its own terms. You will follow his reasoning step by step, from what the word ought means to whether the three can be reconciled.
Who it’s for. This book suits readers who enjoy clear, fair-minded argument, and anyone curious about how utilitarians, Kantians and common-sense moralists really differ.
The 10 key ideas
Key idea 1 · free to read
Ethics asks what ought to be done
Sidgwick begins by fixing his subject. A method of ethics is any rational procedure for deciding what an individual ought to do through voluntary action. Politics asks how a state should be governed. The sciences describe what is, and ethics asks what is right.
He then asks which ends common sense accepts as rational. Only two have a strong claim, happiness and the excellence of human nature. Happiness divides again, since it may be your own or everyone's. That gives three methods, which he calls Egoism, Intuitionism, and Utilitarianism.
His plan is unusual. He offers neither a new system nor a history of old ones, but sets each method beside the others and follows it to its conclusions. Know which method you are using before you argue about its results.
- 2Start free to read
Politics and ideal societies cannot settle private duty
Sidgwick asks how ethics relates to politics.
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Ought is a unique idea that reason grasps
Sidgwick holds that the word ought names something that cannot be reduced to anything else.
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Free will matters less to ethics than it seems
Sidgwick takes up the old quarrel over free will, but only for its bearing on practice.
- 5Start free to read
The pursuit of pleasure undermines itself
Many thinkers assume that everyone always seeks only pleasure.
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Egoism cannot be made exact or certain
Book Two examines Egoism, which makes your own greatest happiness the ultimate end.
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Common sense morality is vague at its edges
Book Three tests Intuitionism, the method that treats certain duties as binding without regard to results.
- 8Start free to read
Only a few abstract moral axioms survive testing
Sidgwick asks what it would take for a moral principle to count as truly self-evident.
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Universal happiness is the final standard of right
Book Four turns to Utilitarianism.
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Reason may be divided against itself
In the concluding chapter Sidgwick asks how the three methods relate.
Read all 10 key ideas now
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Check yourself
Why does Sidgwick distinguish moral judgment from a feeling of approval?
Right. “A judgment of duty claims to be true for every rational being who judges correctly.”Not quite. “A judgment of duty claims to be true for every rational being who judges correctly.”
How should Utilitarianism treat familiar moral rules?
Right. “Use the greatest happiness principle to refine moral rules, not to dismiss them lightly.”Not quite. “Use the greatest happiness principle to refine moral rules, not to dismiss them lightly.”
What conflict remains unresolved in Sidgwick's argument?
Right. “What remains is the dualism between self-interest and duty.”Not quite. “What remains is the dualism between self-interest and duty.”
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Questions about The Methods of Ethics
What is The Methods of Ethics about?
It examines the ways people reason about what they ought to do. Sidgwick separates three methods, Egoism, Intuitionism, and Utilitarianism, and tests how far each can be made clear, consistent, and reliable.
What are the three methods of ethics in Sidgwick's book?
Egoism aims at your own greatest happiness. Intuitionism follows duties that seem binding in themselves. Utilitarianism aims at the greatest happiness of all. Sidgwick treats them as natural ways of thinking that he tries to make rational.
What does Sidgwick mean by the dualism of the practical reason?
He means that reason seems to support both seeking your own happiness and promoting everyone's happiness. He finds each claim reasonable on its own, and he does not find a logical way to join them without a moral order.
Is Sidgwick a utilitarian?
He is usually seen as one, because his reasoning favors universal happiness as the final standard. Yet he says his goal is to examine all three methods fairly, and he admits that Egoism cannot be refuted.
Is The Methods of Ethics worth reading today?
Yes for anyone who wants clear arguments about duty, happiness, and justice. Sidgwick states problems plainly, defines his terms, and shows where each view works and where it leaves open questions.
Cite this edition
Sidgwick, Henry. The Methods of Ethics. Library of Alexandria, 2026, libraryofalexandria.com/products/the-methods-of-ethics.
Sidgwick, H. (2026). The methods of ethics. Library of Alexandria. https://libraryofalexandria.com/products/the-methods-of-ethics (Original work published 1874)
Sidgwick, Henry. The Methods of Ethics. Library of Alexandria, 2026. https://libraryofalexandria.com/products/the-methods-of-ethics.
@book{sidgwick2026methods,
author = {Sidgwick, Henry},
title = {The Methods of Ethics},
publisher = {Library of Alexandria},
year = {2026},
url = {https://libraryofalexandria.com/products/the-methods-of-ethics},
note = {First published 1874}
}
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