John Stuart Mill's On Liberty, published in 1859, examines the nature and limits of the power that society may legitimately exercise over an individual. Mill is concerned not only with coercion by governments but also with social pressure, moral conformity and what he calls the tyranny of the majority. His central claim is that a mature person's freedom may be restricted against that person's will only to prevent harm to others. A person's own physical or moral good may justify advice, persuasion or warning, but not compulsion.
The argument belongs to Mill's wider utilitarian philosophy, yet it gives individuality and freedom an unusually strong place within human well-being. Liberty matters because people are fallible, because truth emerges through contest, and because different ways of living provide experiments from which individuals and societies can learn. A community that silences disagreement or imposes one approved character may appear orderly while losing the intellectual and moral energy needed for improvement.
Chapter I distinguishes civil or social liberty from the metaphysical problem of free will. Earlier struggles for liberty opposed rulers to subjects, but representative government does not remove the danger of oppression. A democratic majority can use law and public opinion against minorities. Mill therefore seeks a principle separating conduct answerable to society from conduct primarily concerning the individual.
Chapter II develops an extensive defence of freedom of thought and discussion. A suppressed opinion may be true; if false, it may force true beliefs to be understood rather than repeated as lifeless formulas; and most disputed doctrines contain partial truths that require combination. Human judgement becomes more trustworthy only through exposure to criticism and correction.
Chapter III treats individuality as an element of well-being. Mill opposes mechanical conformity and argues that people should develop judgement, desire and character through active choice. Originality benefits both the person who lives differently and the society that encounters new possibilities. Customs contain accumulated experience, but following custom without reflection does not exercise the faculties that make a life one's own.
Chapter IV asks where social authority begins. Conduct affecting others may properly be regulated, and individuals owe duties not to injure interests that deserve recognition as rights. Purely self-regarding conduct should remain free even when others consider it foolish. Mill recognises that actions rarely occur in complete isolation, so the practical task is to distinguish genuine harm from mere dislike, offence or moral disapproval.
Chapter V applies the principle to trade, safety, contracts, education, intoxication and public administration. The examples show that liberty is not a slogan against every regulation. Warnings, disclosure requirements and rules preventing direct danger can enlarge rather than diminish meaningful choice. Mill also fears the concentration of all initiative in the state, since citizens become dependent and passive when government replaces voluntary activity.
Mill dedicated the work to Harriet Taylor Mill, whom he credited as an intellectual partner in its development. The edition used here contains Mill's dedication and the complete five-chapter text; W. L. Courtney's later biographical introduction has been omitted so that the reading sections contain Mill's work itself. On Liberty remains influential because it joins a defence of personal independence with an account of public reasoning, fallibility and social progress.
Dedication
To the beloved and deplored memory of her who was the inspirer, and in part the author, of all that is best in my writings—the friend and wife whose exalted sense of truth and right was my strongest incitement, and whose approbation was my chief reward—I dedicate this volume. Like all that I have written for many years, it belongs as much to her as to me; but the work as it stands has had, in a very insufficient degree, the inestimable advantage of her revision; some of the most important portions having been reserved for a more careful re-examination, which they are now never destined to receive. Were I but capable of interpreting to the world one-half the great thoughts and noble feelings which are buried in her grave, I should be the medium of a greater benefit to it than is ever likely to arise from anything that I can write, unprompted and unassisted by her all but unrivalled wisdom.