The political thought of philosopher John Stuart Mill was greatly inspired by the concepts of liberty and utilitarianism. Mill believed in the importance of individual freedom as a cornerstone of a progressive society. He argued that personal liberties must be preserved unless they cause harm to others, encapsulated in his principle of harm. Mill's advocacy for women's rights and social reforms was also influenced by a utilitarian perspective, aiming for the greatest happiness for the greatest number. His works laid the foundation for modern liberal thought.