This book introduces readers to Catholic social teaching, the Church's long tradition of reflection on the meaning of social justice and how to enact it. The Church derives its faith-based principles for promoting justice and peace from rich sources in scripture, theology, reason, and human experience. These teachings, as contained in papal encyclicals and documents from global gatherings of bishops, have inspired broad efforts to advocate for so many important goals-including human rights, the common good, equitable international development, disarmament, healthy family life, and labor justice. Readers will be led step-by-step to a deeper understanding of the demands of social justice in the world today. They will also examine the building blocks of Catholic social teaching, including its key themes, sources, and methods for clarifying values and reaching firm conclusions, always in ways appropriate to pluralistic modern societies. Along the way, readers will encounter great heroes of social change and prophets of peace and justice. This new fourth edition includes expanded coverage of such topics as global migration and climate change, new case studies applying ethical principles to currently pressing social issues, and the major social teaching of Pope Francis. The book culminates with a description of the social justice advocacy of Pope Francis who has renewed Catholic social teaching in many distinctive ways. He has provided new resources that empower the church to navigate the many crises facing the world today. These include the refugee and environmental crises, profound challenges to family life and economic justice, and the desperate need for more effective diplomacy and global peacebuilding. A number of helpful resources contained in this volume, including eight tables, discussion questions, topics for further study, and an annotated list of print and web resources on Catholic social teaching, make this volume a perfect text for college-level courses on social justice.