A short life of the author
Henry Sidgwick was the greatest English moral philosopher of the Victorian era and arguably the most important moral philosopher in the utilitarian tradition after John Stuart Mill. His masterwork, The Methods of Ethics (1874), was not merely a contribution to ethical theory but its definitive restatement — a book that took the three principal approaches to moral reasoning available in the Western tradition (egoism, intuitionism, and utilitarianism), subjected each to the most rigorous analysis they had ever received, and attempted to determine whether they could be reconciled into a coherent system. The answer, Sidgwick concluded, was that they could not — and the candour with which he acknowledged this failure, the so-called “dualism of practical reason,” was itself a landmark of intellectual honesty.
Cambridge
Sidgwick was born in Skipton, Yorkshire, in 1838, and spent virtually his entire adult life at Trinity College, Cambridge. He was educated at Rugby School and entered Trinity in 1855, where he became a Fellow in 1859 and eventually the Knightbridge Professor of Moral Philosophy (1883–1900). Cambridge was not merely his institutional home; it was the intellectual environment in which his particular combination of rigour, caution, and systematic ambition found its natural expression.
In 1869, Sidgwick resigned his fellowship at Trinity because he could no longer honestly subscribe to the Thirty-Nine Articles of the Church of England — a requirement for holding a fellowship at the time. The act was characteristic: Sidgwick’s conscience was so scrupulous that he was incapable of the conventional evasions by which most Fellows maintained their positions without genuine belief. Trinity subsequently changed its rules, and Sidgwick was re-elected.
He was a central figure in the movement for women’s higher education at Cambridge, co-founding Newnham College with Anne Jemima Clough in 1871 and serving as its most active supporter for the rest of his life. He married Eleanor Mildred Balfour (sister of the future Prime Minister Arthur Balfour) in 1876; she became Principal of Newnham.
The Methods of Ethics
The Methods of Ethics appeared in 1874 and went through seven editions during Sidgwick’s lifetime, each substantially revised. The book’s argument was both simple in structure and extraordinarily complex in execution.
Sidgwick identified three “methods” by which individuals actually reason about moral questions: egoistic hedonism (the rational pursuit of one’s own greatest happiness), intuitionism (the recognition of self-evident moral principles through a kind of moral perception), and universalistic hedonism (utilitarianism — the principle that one ought to act so as to maximise the greatest happiness of the greatest number).
His analysis of each method was devastating in its thoroughness. He showed that egoism, while internally consistent, could not generate moral obligations to others. He showed that intuitionism, while capturing real features of moral experience, was undermined by the disagreements among supposedly self-evident principles. And he showed that utilitarianism, while the most systematic and practically applicable of the three methods, could not be derived from self-evident premises without assuming what it sought to prove.
The most famous conclusion of the work was the “dualism of practical reason” — the recognition that egoism and utilitarianism were both rationally defensible but ultimately irreconcilable. When self-interest and the general good conflicted, reason alone could not determine which should prevail. Sidgwick regarded this conclusion as a failure — he had hoped to find a rational foundation for morality that would resolve the conflict — but his honest acknowledgment of the problem became one of the most discussed passages in the history of moral philosophy.
Other Works
The Principles of Political Economy (1883) was a treatise that attempted to do for economics what The Methods of Ethics had done for moral philosophy — provide a systematic, critical analysis of the leading approaches. The book was influential in its time, though it was overshadowed by Marshall’s Principles (1890).
The Elements of Politics (1891) applied utilitarian principles to the theory of the state. Outlines of the History of Ethics (1886) was a concise survey that remained a standard text for decades. The Development of European Polity (1903, posthumous) was a history of political institutions.
Psychical Research
Sidgwick was also the first president of the Society for Psychical Research (founded 1882), an organisation dedicated to the scientific investigation of telepathy, clairvoyance, and survival after death. His involvement was not a lapse of rationality but an expression of it: Sidgwick believed that the question of whether consciousness survived bodily death was an empirical question that deserved rigorous investigation, not dismissal. He brought to the subject the same meticulous standards of evidence he applied to moral philosophy, and the Society’s early work under his presidency established protocols for investigating paranormal claims that remain influential.
Legacy
Sidgwick’s influence on subsequent moral philosophy has been immense. His analysis of utilitarianism directly shaped the work of G. E. Moore, R. M. Hare, and Derek Parfit (whose On What Matters [2011] is essentially an attempt to resolve the dualism of practical reason that Sidgwick identified). John Rawls described The Methods of Ethics as the work that defined the problems with which twentieth-century moral philosophy had to grapple.
Collecting Sidgwick
The Methods of Ethics (Macmillan, 1874) in first edition is the primary target and is genuinely scarce. The seventh edition (1907), with Sidgwick’s final revisions, is the textually definitive version. The Principles of Political Economy (Macmillan, 1883) and The Elements of Politics (Macmillan, 1891) are collected as part of the Victorian philosophy canon. Sidgwick’s correspondence, much of it unpublished during his lifetime, provides rich associational material connecting him to the intellectual elite of Victorian Cambridge.