On Liberty by John Stuart Mill is one of the most influential works ever written on individual freedom. In this enduring classic, Mill examines the limits of authority that society and the state may legitimately exercise over the individual. At the heart of the book lies Mill's famous principle: power can only be rightfully exercised over a member of a civilized community against their will to prevent harm to others. From this foundation, he builds a powerful defense of freedom of thought, expression, and individuality. With clarity, passion, and philosophical depth, Mill argues that diverse opinions and independent minds are essential to the progress of society. On Liberty remains a cornerstone of modern liberal thought and an essential text for anyone interested in freedom, democracy, and human rights.