What is justice? How do we know justice? How is justice cultivated in society? These are the three questions that guide this critical dialogue with two representatives of the Catholic and Protestant traditions: Karl Barth and Karol Wojtyla/John Paul II. Though the two thought leaders are shaped within divergent theological traditions and historical contexts, they both appeal to Christian anthropology as a starting point for justice. Their explorations into the nature of humanity yield robust new theories of justice that remain relevant for our contemporary era. The third interlocutor, Stephanie Mar Brettmann, brings her own voice fully into the dialogue in the third part of the book in order to address possible shortcomings in their theories and build upon their insights, all the while seeking theories of humanity and social justice that result in justice for all persons.