The Harm Principle

From On Liberty by John Stuart Mill
Mill's foundational principle that the only legitimate ground for coercing individuals is to prevent harm to others; one's own good is never sufficient warrant.
Chapter 1, paragraph 9

The canonical statement: 'The object of this Essay is to assert one very simple principle... that the sole end for which mankind are warranted... in interfering with the liberty of action of any of their number, is self-protection.'

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Chapter 1, paragraph 9
Over himself, over his own body and mind, the individual is sovereign.
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Chapter 4, paragraphs 1-3

Distinction between self-regarding and other-regarding conduct, restating the limits of society's authority over the individual.

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