On Liberty is a classic of political philosophy published in 1859 by the British philosopher John Stuart Mill. The book revolves around the boundary between individual liberty and social authority, setting out the famous "harm principle": society or the state has justified grounds for interfering with a person's conduct only when that conduct harms others; conduct and choices that concern the individual alone should be respected to the greatest possible extent. Mill discusses freedom of thought and expression, the development of individuality, and the invisible pressure society exerts on the individual—the "tyranny of the majority" and the despotism of custom—arguing that liberty is a necessary condition for personal growth and social progress. Because the title is often shortened to Liberty in various reading lists and collections, this entry refers to Mill's well-known work on liberty and not to other works of the same name. Note that the exact publisher, translator, year of publication, and ISBN of this edition could not be verified, so those fields are left blank; readers are advised to confirm a copy by the full title On Liberty and the author Mill when buying or borrowing, to avoid confusion with books of the same name. The book is short, yet tightly argued and dense with ideas—one of the essential primary texts for understanding modern ideas of liberty, debates over free speech, and the boundaries of individual rights.
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John Stuart Mill was a British philosopher, political economist, and logician, and a leading figure of nineteenth-century liberal thought. Publicly available information is limited, so this introduction focuses on his enduring works. The library holds two of his books: A System of Logic Ratiocinative and Inductive, which sets out methods of induction and deduction and has long been regarded as a classic of logic, and On Liberty, which argues over the boundary between individual freedom and social authority and is a celebrated text in political philosophy. His writing is known for rigorous argument and clear structure, deducing concrete conclusions from principles in a restrained yet persuasive style. These two works established his standing in logic and in liberty theory, and they have had a lasting influence on later thought and public debate.
