Utilitarianism
Mill defends utilitarianism, the doctrine that actions are right insofar as they promote happiness and wrong insofar as they produce its opposite. He clarifies common misconceptions, argues that pleasures differ in quality as well as quantity, addresses the sources of moral obligation, offers a quasi-proof that happiness is the sole ultimate end, and finally reconciles justice with utility by showing that justice names the most vital class of utility-based moral rules.