On Liberty asks when society has the right to limit individual freedom. Mill argues that people should be free to think, speak, and live differently unless their conduct harms others. He worries not only about government tyranny but also about social pressure, majority opinion, and the quiet punishment of unpopular views.
Key ideas
- Freedom of thought and discussion protects truth.
- Individuality is part of human flourishing.
- Social pressure can become a form of tyranny.
- Coercion is strongest when preventing harm to others.
Why it matters: It matters because it remains one of the clearest arguments for liberal freedom and open discussion.
Modern relevance: It applies to speech debates, personal choice, public policy, online pressure, education, and workplace norms.