How did John Stuart Mill connect individual self-development to the progress of society?

John Stuart Mill believed that the progress of society is inextricably linked to the cultivation and freedom of the individual. Moving beyond the purely pragmatic utilitarianism of his predecessors, he argued that the true worth of a state is ultimately determined by the worth of the individuals who compose it.1

Mill contended that civilization requires the free play of speculative intelligence and the contributions of creative minds to avoid becoming a "stagnant pool". He emphasized that progress results from the free exercise of the human mind rather than merely the blind forces of economic competition. Consequently, he was a staunch advocate for the liberty of opinion, warning that civilizations ossify without it.1

Furthermore, Mill maintained that a government or state that "dwarfs its men"—stifling individual development or restricting free choice—is culturally and socially insignificant. By championing the emancipation of women and the importance of education, he sought to foster a society where individuals could reach their full potential, viewing this personal growth as the essential engine for broader social advancement.1