The A. intends to show the influence that, 20 years after the Council, the Roman Catholic Church, in following the directives of UR, has valued; he does so by underlining some doctrinal principles held fundamental for the passage to a truly ecumenical era. The first principle underscored is that of the «perpetua indigentia» and the «perennis reformatio». The Church has inherited this principle with sincerity and determination, however with a displacement of accent which favors the interior movement of conversion and leaves at a distance the exigences of transforming, with the heart, even institutions. The second principle underlined takes up the limits of «perennis reformatio»: the customs, discipline and emendation of doctrine; in this latter sphere one has the impression that the principle of distinguishing between «depositum fidei» and «doctrinae enuntiandae modus» has not been inherited with necessary responsability. The third principle underscored is that of the hierarchy of truth. it seems as if the churches were persuing the unity of identity and not that of the «communio». For this they must begin to have deep experiences and become involved in «communio» , so as to learn from the inside of this experience what the path to unity is (pp. 484-515).