The question arises: Why has the implementation of the Council, in large parts of the Church, thus far been so difficult?
Well, it all depends on the correct interpretation of the Council or—as we would say today—on its proper hermeneutics, the correct key to its interpretation and application. The problems in its implementation arose from the fact that two contrary hermeneutics came face to face and quarreled with each other. One caused confusion, the other, silently but more and more visibly, bore and is bearing fruit.
On the one hand, there is an interpretation that I would call “a hermeneutic of discontinuity and rupture”; it has frequently availed itself of the sympathies of the mass media, and also one trend of modern theology. On the other, there is the “hermeneutic of reform,” of renewal in the continuity of the one subject-Church which the Lord has given to us. She is a subject which increases in time and develops, yet always remaining the same, the one subject of the journeying People of God.
The hermeneutic of discontinuity risks ending in a split between the pre-conciliar Church and the post-conciliar Church. It asserts that the texts of the Council as such do not yet express the true spirit of the Council. It claims that they are the result of compromises in which, to reach unanimity, it was found necessary to keep and reconfirm many old things that are now pointless. However, the true spirit of the Council is not to be found in these compromises but instead in the impulses toward the new that are contained in the texts.- Rorate Caeili 10th Anniversary of the Hermeneutic of Continuity Speech
The question arises:
Since the error from the Letter of the Holy Office 1949 was not identified and the error was repeated in Vatican Council II and the Catechism of the Catholic Church. It is also there in magisterial documents like Redemptoris Missio and Dominus Iesus. It is one single cause responsible for the heremeneutic of rupture in the interpretation of Vatican Council II.
Here is the troublesome passage.
' that one may obtain eternal salvation, it is not always required that he be incorporated into the Church actually as a member, but it is necessary that at least he be united to her by desire and longing.'- Letter of the Holy Office 1949