Philosophy › The 19th century › John Stuart Mill
On Liberty and the harm principle
1859· Book or text· Politics, society & justice
Well documentedSolid records, texts or physical evidence.
Mill's 1859 essay arguing that society may restrict a person's freedom only to prevent harm to others.
See it on the Philosophy map →The idea
The idea: 'The only purpose for which power can be rightfully exercised over any member of a civilized community, against his will, is to prevent harm to others.' A person's own good is not enough reason. Mill feared not just government but the 'tyranny of the majority,' social pressure to conform. Silencing an opinion is wrong because it may be true, and even false views keep truth from hardening into dead dogma. Main objection: 'harm' is slippery, and Mill exempted children and 'barbarous' societies.
Why it matters
It is the classic argument for free speech and personal liberty, cited in courts and in debates over speech, drugs, sexuality and paternalism.
Think of it like
Like a lease: tenants may run their own unit as they please, but the landlord steps in when their choices damage neighbors or the building.
Where it comes from
Published in February 1859; James Fitzjames Stephen's Liberty, Equality, Fraternity (1873) was its first major rebuttal, and it has never gone out of print.
Still debated
Where the line between self-regarding and other-regarding acts falls; in practice nearly every act affects someone else.
Connections (2)
▸John Stuart Mill wrote On Liberty and the harm principleWell documented
The connection
Mill planned the essay with Harriet Taylor from 1854, fearing that conformity in mass society threatened individuality. When she died in 1858 he published it unaltered as a memorial, dedicating it to her as 'the inspirer, and in part the author, of all that is best in my writings.'
When and how
London; conceived in 1854–55, partly while Mill traveled in Italy; published by John W. Parker in February 1859.
How we know
Mill's Autobiography (1873), his letters and the dedication describe its writing and Harriet Taylor's role.
Debates and open questions
How much Harriet Taylor actually wrote; scholars range from treating her as a true co-author to reading Mill's tribute as devotion.
▸On Liberty and the harm principle shaped the liberalism of John Rawls, A Theory of JusticeMostly agreed
The connection
Mill defended wide personal freedom, limited only by harm to others. Rawls's first principle gives priority to equal basic liberties, such as speech, conscience and association, which cannot be traded away for economic gain. Rawls shared Mill's liberal aims but rejected his utilitarian grounding, arguing liberty needs a firmer basis than total welfare.
When and how
On Liberty (1859) and A Theory of Justice (1971); Rawls's Harvard lectures on Mill appear in Lectures on the History of Political Philosophy (2007).
How sure are we?
Rawls discusses Mill's arguments for liberty in the book and his lectures, but much of his liberalism came from Kant and the contract tradition, so the link is real but partial.
Debates and open questions
Whether Rawls' priority of liberty is better grounded than Mill's, and whether Mill's defense of liberty is truly utilitarian, are both debated.