Pius XII taught in Humani Generis that "the Mystical Body of Christ and the Roman CatholicChurch are one and the same thing" (Encyclical Humani Generis
《天主教百科全書》(TheCatholic Encyclopedia: An International Work of Reference on the Constitution, Doctrine, Discipline, and HistoryoftheCatholicChurch)或稱舊天主教百科全書(Old