The term “social justice”… is the key term and concept of Catholic social teaching … with all the other aspects of the Church’s social doctrine—the principle of subsidiarity, the just wage or the right to private property—are related to, and rely, on the existence of social justice. The term “social justice,” though common enough today, is little understood by most of those who use it—whether they consider themselves friends and practitioners of social justice, or they regard it as a suspect term of probably socialist origin. But the term does have a precise meaning. That meaning and the significance of...