Widely hailed as one of the most significant works in modern political philosophy, John Rawls's Political Liberalism (1993) defended a powerful vision of society that respects reasonable ways of life, both religious and secular. These core values have never been more critical as anxiety grows over political and religious difference and new restrictions are placed on peaceful protest and individual expression. In her introduction to the volume, Martha Nussbaum discusses the main themes of Political Liberalism and puts them into the context of contemporary philosophical debates.