By Cardinal Gerhard Mueller, The Catholic Thing - The pope’s intention with his motu proprio, Traditionis Custodes, is to secure or restore the unity of the Church. The proposed means for this is the total unification of the Roman Rite in the form of the Missal of Paul VI... Therefore, the celebration of Mass in the Extraordinary Form of the Roman Rite, as introduced by Pope Benedict XVI with Summorum pontificum (2007) on the basis of the Missal that existed from Pius V (1570) to John XXIII (1962), has been drastically restricted. The clear intent is to condemn the Extraordinary Form to extinction in the long run.