Little catechism of the Second Vatican Council by Fr. Pierre-Marie, O.P. Dominican in Avrillé Preface Vatican II is not a council like the others. This concil, which was held in St. Peter's Basilica in the Vatican in four sessions from 1962 until 1965 under the pontificates of Popes John XIII (1958-1963) and Paul VI (1963-1978), was the occasion, if not the principal cause, of the gravest crisis the Church has known in its history. The studies concerning this council are numerous, but often voluminous and very technical. We have thought that it would be useful to provide for Catholics of good will a relatively short text, explaining what Vatican II declared and what is unacceptable for Catholics who want to remain faithful to the traditional infallible teaching of the Church. After a brief introduction on the authority of the council, we will briefly analyze each of the 16 documents, presenting them in a thematic order. Introduction The authority of the Second Vatican Council What is an ecumenical council? An ecumenical council is an assembly of bishops of the entire world convoked by the pope, who conducts its meetings (called "sessions"), whether directly or via legates, and who approves the texts so that they have a binding value for the whole Church. There have been in the history of the Church twenty ecumenical councils since the Council of Nicea in 325 until the First Vatican Council in 1870. Is Vatican II a council like the others? Vatican II is an atypical council because the popes who convoked and conducted it, John XXIII and Paul VI, declared that it was not a dogmatic council, like all the preceding councils, but a pastoral council. In other words, its aim was not to define doctrine against errors, but to perform an updating ("aggiornamento") of this doctrine to adapt it to the thinking of our contemporaries. Does Vatican II contain infallible teachings? Here again, differently than all the preceding ecumenical councils, the Second Vatican Council does not contain any infallible teaching. For a council to be infallible, it must pronounce solemn judgments, which this council refused to do. Even if it is not infallible, can it not be admitted that Vatican II was assisted by the Holy Ghost? Our Lord Jesus Christ promised the assistance of the Holy Ghost for the transmission of Revelation: "the Paraclete the holy Ghost, whom the Father will send in my name, he shall teach you all things, and suggest unto you all things whatsoever I shall say to you.