In more recent times, the Second Vatican Council expressed the desire that the respect and reverence due to divine worship should be renewed and adapted to the needs of our time. In response to this desire, our predecessor Pope Paul VI in 1970 approved for the Latin Church revised and in part renewed liturgical books; translated into various languages throughout the world, these were willingly received by the bishops as well as by priests and the lay faithful. Pope John Paul II approved the third typical edition of the Roman Missal. In this way the Popes sought to ensure that “this liturgical edifice, so to speak … reappears in new splendour in its dignity and harmony.” [4]
In some regions, however, not a few of the faithful continued to be attached with such love and affection to the earlier liturgical forms which had deeply shaped their culture and spirit, that in 1984 Pope John Paul II, concerned for their pastoral care, through the special Indult Quattuor Abhinc Annos issued by the Congregation for Divine Worship, granted the faculty of using the Roman Missal published in 1962 by Blessed John XXIII. Again in 1988, John Paul II, with the Motu Proprio Ecclesia Dei, exhorted bishops to make broad and generous use of this faculty on behalf of all the faithful who sought it.
Given the continued requests of these members of the faithful, long deliberated upon by our predecessor John Paul II, and having listened to the views expressed by the Cardinals present at the Consistory of 23 March 2006, upon mature consideration, having invoked the Holy Spirit and with trust in God’s help, by this Apostolic Letter we decree the following:
Art 1. The Roman Missal promulgated by Pope Paul VI is the ordinary expression of the lex orandi (rule of prayer) of the Catholic Church of the Latin rite. The Roman Missal promulgated by Saint Pius V and revised by Blessed John XXIII is nonetheless to be considered an extraordinary expression of the same lex orandi of the Church and duly honoured for its venerable and ancient usage. These two expressions of the Church’s lex orandi will in no way lead to a division in the Church’s lex credendi (rule of faith); for they are two usages of the one Roman rite.