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John Stuart Mill's essay On Liberty (1859) argues for the utmost importance of individual liberty, asserting that the only justification for interfering with a person's actions is to prevent harm to others. This principle, known as the harm principle, suggests that society and government should not infringe upon individual freedoms for their own supposed good, whether moral or physical. Mill contended that the free collision of ideas is essential for discovering truth and that restricting speech is never justified. He advocated for a society that maximizes individual choice and action, provided it does not perceptibly harm others, forming a cornerstone of modern democracy.123

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