1 JOHN XXIII, Address of 11 October 1962: “…The Council…wishes to transmit Catholic doctrine, whole and entire, without alteration or deviation…But in the circumstances of our times it is necessary that Christian doctrine in its entirety, and with nothing taken away from it, is accepted with renewed enthusiasm, and serene and tranquil adherence… it is necessary that the very same doctrine be understood more widely and more profoundly as all those who sincerely adhere to the Christian, Catholic and Apostolic faith strongly desire …it is necessary that this certain and immutable doctrine, to which is owed the obedience of faith, be explored and expounded in the manner required by our times. The deposit of faith itself and the truths contained in our venerable doctrine are one thing, but the manner in which they are annunciated is another, provided that the same fundamental sense and meaning is maintained” : AAS 54 [1962] 791-792.
2 Cf. PAUL VI, Address of 29 September 1963: AAS 55 [1963] 847-852.
3 PAUL VI, Address of 21 November 1964: AAS 56 [1964] 1009-1010.
4 The Council wished to express the identity of the Church of Christ with the Catholic Church. This is clear from the discussions on the decree Unitatis redintegratio. The Schema of the Decree was proposed on the floor of the Council on 23.9.1964 with a Relatio (Act Syn III/II 296-344). The Secretariat for the Unity of Christians responded on 10.11.1964 to the suggestions sent by Bishops in the months that followed (Act Syn III/VII 11-49). Herewith are quoted four texts from this Expensio modorum concerning this first response.
A) [In Nr. 1 (Prooemium) Schema Decreti: Act Syn III/II 296, 3-6]
“Pag. 5, lin. 3-6: Videtur etiam Ecclesiam catholicam inter illas Communiones comprehendi, quod falsum esset.
R(espondetur): Hic tantum factum, prout ab omnibus conspicitur, describendum est. Postea clare affirmatur solam Ecclesiam catholicam esse veram Ecclesiam Christi” (Act Syn III/VII 12).
B) [In Caput I in genere: Act Syn III/II 297-301]
“4 - Expressius dicatur unam solam esse veram Ecclesiam Christi; hanc esse Catholicam Apostolicam Romanam; omnes debere inquirere, ut eam cognoscant et ingrediantur ad salutem obtinendam…
R(espondetur): In toto textu sufficienter effertur, quod postulatur. Ex altera parte non est tacendum etiam in aliis communitatibus christianis inveniri veritates revelatas et elementa ecclesialia”(Act Syn III/VII 15). Cf. also ibid pt. 5.
C) [In Caput I in genere: Act Syn III/II 296s]
“5 - Clarius dicendum esset veram Ecclesiam esse solam Ecclesiam catholicam romanam…
R(espondetur): Textus supponit doctrinam in constitutione ‘De Ecclesia’ expositam, ut pag. 5, lin. 24-25 affirmatur” (Act Syn III/VII 15). Thus the commission whose task it was to evaluate the responses to the Decree Unitatis redintegratio clearly expressed the identity of the Church of Christ with the Catholic Church and its unicity, and understood this doctrine to be founded in the Dogmatic Constitution Lumen gentium.
D) [In Nr. 2 Schema Decreti: Act Syn III/II 297s]
“Pag. 6, lin. 1- 24: Clarius exprimatur unicitas Ecclesiae. Non sufficit inculcare, ut in textu fit, unitatem Ecclesiae.
R(espondetur): a) Ex toto textu clare apparet identificatio Ecclesiae Christi cum Ecclesia catholica, quamvis, ut oportet, efferantur elementa ecclesialia aliarum communitatum”.
“Pag. 7, lin. 5: Ecclesia a successoribus Apostolorum cum Petri successore capite gubernata (cf. novum textum ad pag. 6, lin.33-34) explicite dicitur ‘unicus Dei grex’ et lin. 13 ‘una et unica Dei Ecclesia’ “ (Act Syn III/VII).
The two expressions quoted are those of Unitatis redintegratio 2.5 e 3.1.
5 Cf. SECOND VATICAN COUNCIL, Dogmatic Constitution Lumen gentium, 8.1.
6 Cf. SECOND VATICAN COUNCIL, Decree Unitatis redintegratio, 3.2; 3.4; 3.5; 4.6.
7 SECOND VATICAN COUNCIL, Dogmatic Constitution, Lumen gentium, 8.2.
8 Cf. CONGREGATION FOR THE DOCTRINE OF THE FAITH, Declaration Mysterium Ecclesiae, 1.1: AAS 65 [1973] 397; Declaration Dominus Iesus, 16.3: AAS 92 [2000-II] 757-758; Notification on the Book of Leonardo Boff, OFM, “Church: Charism and Power”: AAS 77 [1985] 758-759.
9 Cf. JOHN PAUL II, Encyclical Letter Ut unum sint, 11.3: AAS 87 [1995-II] 928.