In this clear and rigorous study of Catholic Social Teaching, Sr. Mary Consilia O’Brien examines the dignity of the human person, the nature of freedom, and the proper relationship between the individual and society. Drawing on St. Thomas Aquinas and papal encyclicals, she evaluates modern political ideologies and clarifies the moral principles that must guide social order. With practical examples and study aids, this book presents a coherent vision of society ordered to truth, justice, and the ultimate good of the human person in God.