The Teaching of the Catholic Church: As Contained in Her Documents is a classic reference work that compiles key doctrinal texts of the Catholic Church in one volume. It was originally prepared by Josef Neuner and Heinrich Roos and later edited by the prominent theologian Karl Rahner. The primary purpose of TCC is not to provide a narrative summary, but rather to offer direct access to the sources of Catholic doctrine. It serves as a practical handbook for theologians, students, and interested laypersons by gathering numerous official pronouncements (documents, canons, decretals, encyclicals, etc.) from various periods of Church history into an organized, thematic collection. The documents are presented to illustrate the historical development and consistent nature of Catholic teaching.