Book excerpt: The Vision of Catholic Social Thought traces the emergence of solidarity and human rights as critical theological and philosophical pillars of the anthropology and ethics foundational to the development of Catholic social teaching. Meghan J. Clark argues that the integration of human rights and the virtue of solidarity at the root of the Catholic social tradition are the unique contributions Catholic thought makes to contemporary debates in ethics, political and philosophical theory. Building upon the historical framework of the development of Catholic social thought, drawing deeply from the papal encyclical tradition and the theological and ethical developments of Vatican II, Clark forwards a constructive vision of virtue and social practice, applying this critical question of human rights on the international stage.