Ecclesiam Suam §30

³⁰ It would take too long even to summarize the abundant theological literature dealing with the Church and produced by the Church in the course of the nineteenth and twentieth centuries. It would also take too long to pass in review all the documents issued by the Church's hierarchy and this Apostolic See on this monumental and important subject. Eminent theologians have been studying the subject ever since the Council of Trent sought to repair the damage resulting from the great crisis in the sixteenth century which separated so many members from the Church of Christ.