Published in 1859, John Stuart Mill&rsquo;s <i>On Liberty</i> presented one of the most eloquent defenses of individual freedom in nineteenth-century social and political philosophy and is today perhaps the most widely-read liberal argument in support of the value of liberty. Mill&rsquo;s passionate advocacy of spontaneity, individuality, and diversity, along with his contempt for compulsory uniformity and the despotism of popular opinion, has attracted both admiration and condemnation.