On Liberty

Mill states at the outset that his subject is not free will but civil liberty: the nature and limits of the power society may legitimately exercise over an individual.

His framing move is that the danger has shifted. Where once the threat was a ruler acting against the people, in a democratic society the threat is the majority acting against dissenting individuals, which is harder to resist because it operates through opinion rather than law.

In a democracy the threat is not the ruler but the majority, acting through opinion rather than law.

Devmark’s reading — not a quotation from the book

His single governing proposition: the only purpose for which power can rightfully be exercised over any member of a civilised community against their will is to prevent harm to others. A person's own good is not sufficient warrant.

It is the most influential sentence in modern political philosophy and the foundation of most liberal legal reasoning about paternalism. Its difficulty is entirely in the word harm, which the book does not define with the precision the principle requires.

His borrowed phrase, developed further than Tocqueville had. Social tyranny is more formidable than political oppression because it penetrates further, leaves fewer means of escape, and enslaves the soul itself.

His concern is with conformity operating through employment, association and reputation rather than through law — which makes the chapter uncomfortably applicable to contemporary conditions he could not have anticipated.

His second chapter and the strongest sustained defence of free speech ever written. The suppressed opinion may be true. It may contain part of the truth. Even if wholly false, a true belief held without challenge becomes dead dogma. And a belief never contested loses its meaning and its effect on conduct.

The third and fourth arguments are the distinctive ones. He is not only defending the dissenter's right to speak but arguing that the majority needs the dissent to understand its own position.

His term for a true belief held without any grasp of the reasons for it or of the case against it.

His claim that such a belief provides no protection against error, cannot be applied to a new situation, and will collapse when seriously challenged is an argument about the quality of understanding rather than about rights, and it is the part of his case that applies directly to education.

His third chapter, which he regarded as central and which is less often read. Human nature is not a machine to be built to a model but a tree requiring growth in the direction of its own inward forces.

His argument that experiments in living are necessary — that society learns what modes of life are worth having only by permitting people to try them — is the positive case underlying the negative harm principle.

Society discovers which ways of living are worth having only by permitting people to try them.

Devmark’s reading — not a quotation from the book

His fourth and fifth chapters apply the principle: self-regarding conduct is immune, other-regarding conduct is not, and he works through cases including trade, poisons, public indecency, gambling and education.

His treatment shows the difficulty of the distinction. Almost no conduct is purely self-regarding, and his handling of the harder cases is less conclusive than the principle's clarity implies.

Mill attributed the work substantially to his wife Harriet Taylor Mill and described it in his dedication as more hers than his.

Scholars disagree about the extent of her contribution, and the historical tendency was to discount his statement as gallantry. The safest position is that he said it plainly, repeatedly, and had no obvious reason to exaggerate.

Two objections stand. The harm principle depends on a distinction between self- and other-regarding acts that may not survive examination, since almost every action affects someone.

The second is his exclusion of what he calls barbarians and children from the principle's protection, which licensed a paternalist argument for colonial administration — an institution Mill himself worked for. This is not incidental to the text and should not be read past.

Because it is the clearest available statement of a position that every liberal society claims to hold and constantly relitigates.

Every argument about speech, about paternalistic regulation, about professional and social consequences for unpopular views, is conducted in terms this book established, usually by people who have not read it.