Catholic Church and ecumenism
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The Catholic Church has been irrevocably committed to the modern ecumenical movement since the Second Vatican Council (1962-1965), but has always held the unity of the Church as one of its necessary characteristics.
- 1 Definition
- 2 Historical perspectives
- 3 Relations with churches of the east
- 4 Relations with churches and communions of the west
- 4.1 World Council of Churches
- 4.2 The Anglican Communion
- 4.3 Baptists
- 4.4 Disciples of Christ
- 4.5 Evangelical Christians
- 4.6 Lutheran Churches
- 4.7 Mennonites
- 4.8 Methodist Churches
- 4.9 Old Catholic Churches
- 4.10 Reformed Churches
- 4.11 Pentecostal Christians
- 5 Major documents
- 6 See also
- 7 Notes
- 8 References
Ecumenism, from the Greek word “oikoumene,” meaning “the whole inhabited world,” (cf. Acts 17.6; Mt 24.14; Heb 2.5), is the promotion of cooperation and unity among Christians.
The Catholic Church's commitment to ecumenism is based on the conviction that a divided Christianity "openly contradicts the will of Christ, scandalizes the world, and damages the holy cause of preaching to Gospel to every creature."
"The search for Christian Unity was one of the principal concerns of the Second Vatican Council." This was attested to even from the moment the Council was announced, by Pope John XIII, during the vespers closing the Octave of Prayer for Christian Unity, on 25 January 1959, at the Basilica of Saint Paul's Outside the Walls.
"The Catholic Church is committed to working for the reunion of all Christians, but the exuberant spirit following Vatican II has been tempered. Sober minds realize that the road to full unity will be long and arduous. One of the principal ecclesiological tasks is to discern the relationship between the Churches..."  Underlying the Catholic Church’s pursuit of ecumenism is its recognition that elements of sanctification and truth are found in other churches, that these are real Christians and real Churches or ecclesial communities, and that our common baptism itself impels us toward greater unity.
It can be said that the "ecumenicity" of the Church is another way of expressing her "radical catholicity and/or universality (See Guidelines for Lutheran-Roman Catholic Dialogue 1967).
Before the Second Vatican Council
The Catholic Church saw itself as the one, holy, catholic and apostolic church, founded by Christ himself. Its teachings, especially in the decades preceding the Second Vatican Council, equated the one Church of Christ with the Catholic Church, and sometimes as narrowly as the Latin Church alone.
Ecumenism takes as it starting point that Christ founded just one Church, not many churches; hence the Catholic Church has as its ultimate hope and objective – that through prayer, study, and dialogue, the historically separated bodies may come again to be reunited with it.
Unity was always a principal aim of the Catholic Church. Before the Second Vatican Council, the Catholic Church defined ecumenism as a relations with other Christian groups in order to persuade these to return to a unity that they themselves had broken. Some traditionalist Catholics reject the Second Vatican Council reforms and maintain the pre-reform sense of ecumenism.
At the Second Council of Lyon (1274) and the Council of Florence (1438–42), in which some bishops of the Eastern Orthodox Churches participated, reunion formulas were worked out that, however, failed to win acceptance by the Eastern Churches.
The Catholic Church, even before the Second Vatican Council, always considered it a duty of the highest rank to seek full unity with estranged communions of fellow-Christians, and at the same time to reject what it saw as promiscuous and false union that would mean being unfaithful to or glossing over the teaching of Sacred Scripture and Tradition. But the main stress was laid on this second aspect, as exemplified in canon 1258 the 1917 Code of Canon Law:
- It is illicit for the faithful to assist at or participate in any way in non-Catholic religious functions.
- For a serious reason requiring, in case of doubt, the Bishop's approval, passive or merely material presence at non-Catholic funerals, weddings and similar occasions because of holding a civil office or as a courtesy can be tolerated, provided there is no danger of perversion or scandal.
Since the Second Vatican Council
The aim of the Second Vatican Council, as its initiator, Pope John XXIII, stated, was to seek renewal from within the Church itself, which would serve, for those separated from the see of Rome, as a "gentle invitation to seek and find that unity for which Jesus Christ prayed so ardently to his heavenly Father."  The Council opened up an era of earnest endeavour not only to explain to others the Church's teaching, but also to understand their outlook.
While the Catholic Church sees itself as the one, holy, catholic and apostolic church founded by Christ himself, it recognizes that elements of salvation are found in other churches also. In the Second Vatican Council's Lumen gentium, 8, states that the sole church of Christ as "subsists in" (rather than simply saying "is identical with") the Catholic Church:
Nevertheless, many elements of sanctification and truth are found outside its visible confines. Since these are gifts belonging to the Church of Christ, they are forces impelling towards Catholic unity.
The Catholic Church has, since the Second Vatican Council, reached out to other Christian bodies, seeking reconciliation to the greatest degree possible.
Significant agreements have been achieved on baptism, ministry and the eucharist with Anglican theologians. With Lutheran bodies a similar agreement has been reached on the theology of justification. These landmark documents have brought closer fraternal ties with those churches.
However, recent developments, such as the ordination of women and of men living in homosexual relationships, present new obstacles to reconciliation with, in particular, Anglicans. Consequently, in recent years the Catholic Church has focused its efforts at reconciliation with the Orthodox Churches of the East, with which the theological differences are not as great.
While relations with some Eastern Orthodox Churches were strained in the 1990s over property issues in post-Soviet states after the dissolution of the Soviet Union, these differences are now largely resolved. Fraternal relations with the Eastern churches continue to progress.
In practice however, unorthodox interpretations were read into the conciliary documents by laity, priests and bishops. This practice was criticised in the recent document Dominus Iesus.
The 1983 Code of Canon Law has no longer canons who absolutely forbid the cooperation of Catholic priests with clergy members of other systems of belief. It still absolutely forbids Catholic priests to concelebrate the Eucharist with members of communities not in full communion with the Catholic Church (canon 908), but allows, in certain circumstances and under certain conditions, other sharing in the sacraments. The Directory for the Application of Principles and Norms on Ecumenism states: "Christians may be encouraged to share in spiritual activities and resources, i.e., to share that spiritual heritage they have in common in a manner and to a degree appropriate to their present divided state."(n102)
Relations with churches of the east
The Catholic Church recognizes 21 Ecumenical or General Councils: Nicaea I (325), Constantinople I (381), Ephesus (431), Chalcedon (451), Constantinople II (553), Constantinople III (680–681), Nicaea II (787), Constantinople IV (869–870), Lateran I (1123), Lateran II (1139), Lateran III (1179), Lateran IV (1215), Lyons I (1245), Lyons II (1274), Vienne (1311–1312), Constance (1414–1418), Florence (1438–1445), Lateran V (1512–1517), Trent (1545–1563), Vatican I (1869–1870), Vatican II (1962–1965).
Of these, the Orthodox Church of Byzantine tradition accepts only the first seven, the family of "non-Chalcedonian" or "pre-Chalcedonian" Churches only the first three, and the Assyrian Church of the East only the first two.
In spite of this, dialogue has shown that even where divisions have lasted longer than previous communion - as with the schisms rooted in the Christological controversies at the Council of Ephesus (431) and the Council of Chalcedon (451) - the few doctrinal differences often but not always concern terminology, not substance. In fact, as little as a decade of dialogue can do more to heal the divisions than fifteen centuries of apologetics, stereotypes, and suspicion.
Assyrian Church of the East
The Catholic Church recognizes in the Assyrian Church of the East one of the valid successor bodies of the ancient Church of the Mesopotamian valley, where Christianity had been established by around the year 150, though tradition traces apostolic origins with the Apostle Thomas and his disciples/successors Addai and Mari.
The division between the Church of the Persian Empire and the Churches of Rome and Constantinople goes back to the disputes over the legitimacy of the terms mother of God and mother of Christ for the Virgin Mary, that came to a head at the Council of Ephesus in 431. The Assyrian Church had adopted radical Antiochene Christology, as articulated by Nestorius and Theodore of Mopsuestia. They have been sometimes, erroneously, called Nestorian. This appellation is rejected by the Catholic Church.
Dialogue began with a meeting of the Assyrian Patriarch (Catholicos) Mar Dinkha IV and Pope John Paul II in 1984, and the patriarchs participation in the first Assisi Day of Prayer for Peace in 1986. Nearly a decade of dialogue proved sufficient to resolve the disagreements over terminology in Christology, leading to the Common Christological Declaration between the Catholic Church and the Assyrian Church of the East, signed by Pope John Paul II of the Catholic Church, and Mar Dinkha IV of the Assyrian Church of the East in 1994.
The Common Declaration recalls that the Assyrian Church of the East prays to the Virgin Mary as "the Mother of Christ our God and Saviour", and the Catholic tradition addresses the Virgin Mary as "the Mother of God" and also as "the Mother of Christ", fuller expressions by which each Church clearly acknowledges both the divinity and the humanity of Mary's son. The co-signers of the Common Declaration could thus state: "We both recognize the legitimacy and rightness of these expressions of the same faith and we both respect the preference of each Church in her liturgical life and piety."
Over the next six years, annual meetings of the dialogue came to a common understanding of Sacraments, published in 2000 as the "Common Statement on Sacramental Life". It was hoped that this too would be raised to the level of a Joint or Common Declaration, while the dialogue moved on to practical ecclesiological, pastoral, and administrative questions for full communion.
However, in 2004, on the eve of a formal common declaration, the Assyrian patriarch and bishops decided to suspend the dialogue, realizing that "all obstacles to restoring full communion with the Catholic Church had been proven to no longer exist".
The following year the Assyrian synod suspended their chief ecumenist of twenty years, Mar Bawa Soro, who had lead the dialogue with Rome. In 2008, Mar Bawai, along with six priests, thirty deacons, and about a thousand faithful broke communion with the Assyrian Church and entered into full communion as part of the Chaldean Catholic Church. The personal tensions from these events further delayed the continuation of reunion talks.
In March 2015, Mar Dinkha IV died. Calls to delay election of a new patriarch until it could be done in common with the Ancient Church of the East and the Chaldean Catholic Church slowed the process of succession. In September 2015, a new Catholicos-Patriarch was elected, Gewargis III. It is hoped that dialogue can resume and restoration of full communion be established in the near future under the new patriarch.
- 1994 Common Christological Declaration
- 1997 Joint Synodical Decree for Promoting Unity between the Assyrian Church of the East and the Chaldean Catholic Church
- 2001 Guidelines for Admission to the Eucharist Between the Chaldean Church and the Assyrian Church of the East
Oriental Orthodox Churches
Since 2003, the Catholic Church has engaged with the entire communion of Oriental Orthodox Churches as a whole, rather than with each autocephalous church in independent dialogues.
With individual Oriental Orthodox Churches:
- 1971 Common Declaration of Pope Paul VI and Mar Ignatus Jacob III of the Malankara Syrian Orthodox Church
- 1976 Common Christological Declaration of the Catholic Church and the Coptic Church
- 1984 Common Declaration of Pope John Paul II and Mar Ignatius Zakka I Iwas of the Malankara Syrian Orthodox Church
- 1989 Joint Statement of the Catholic and Malankara Orthodox Syrian Churches
- 1990 Doctrinal Agreement on Christology between the Catholic Church and the Malankara Orthodox Syrian Church
- 1993 Agreement and Pastoral Guidelines for Inter-Church Marriage between Catholics and Malankara Syrian Orthodox
- 1999 Joint Statement on the Synod of Diamper (AD 1599) by the Catholic and Malankara Orthodox Syrian Churches
With the Oriental Orthdox Commmunion as a whole:
- 2009 Nature, Constitution, and Mission of the Church
- 2015 The Exercise of Communion in the Life of the Early Church and its Implications for our Search for Communion Today
The Orthodox Church
The 1993 Balamand declaration of the Joint International Commission for Theological Dialogue Between the Catholic Church and the Orthodox Church discusses ecclesiological principles and suggests practical rules for both the Catholic Church and the Eastern Orthodox Churches to implement about improving relations by reciprocally avoiding interfering in each other's Churches and not using history in a polemical manner.[a] According to Cardinal Edward Cassidy, the report contains three principles: that individuals have the freedom to follow their conscience, that Eastern Catholic Churches have the right to exist, that uniatism is not the current method of full communion;(nn3, 13, 15) and two conclusions: that the Catholic Church and the Eastern Orthodox Churches are "sister churches" and that rebaptism should be avoided.(nn14, 19) The principle that "the inviolable freedom of persons and their obligation to follow the requirements of their conscience",(n15) is foundational, according to Cassidy, "and justifies both the personal choice to adhere to the Catholic Church or to the Orthodox Church, and offers the possibility of returning to the Catholic Church for those communities which in 1945–49 had been forced to convert by Communist regimes to become part of the Orthodox Church," as happened in the Ukrainian Soviet Socialist Republic, the Socialist Republic of Romania and the Czechoslovak Socialist Republic. The Eastern Catholics rejected the report "because it seemed to imply they should never have existed in the first place" while the Eastern Orthodox rejected it because it did not call for the abolition of the Eastern Catholic Churches.(pp366–367)[b]
Relations with churches and communions of the west
World Council of Churches
One of the most significant documents on ecumenical relations was Baptism, Eucharist and Ministry, published by the Faith and Order Commission of the World Council of Churches (WCC) in 1982. Although the Catholic Church is not a member of the WCC, some Catholic theologians are full members of the Commission, though not as representatives of their Church, and participated in the production of the paper, the aim of which was to seek common ground between the various traditions concerning the Christian rite of initiation (Baptism), the sacrament of the Eucharist, and the nature of holy orders, while also stating clearly the differences existing between them. The Churches were invited to indicate their reactions to the contents of the document, with a view to "analyz(ing) the ecumenical implications for the churches at a future World Conference on Faith and Order."
The Anglican Communion
Long-term hostility between the Catholic Church and the Anglican Communion was engendered by resistance among some English to the declaration of royal supremacy of King Henry VIII over the Church in England, the confiscation of Church properties, the dissolution of the monasteries, guilds and chantries, the execution of priests, forced attendance at Anglican worship, the forced payment of tithes to the state church and the illegalization of the Catholic faith.
There was a brief restoration of communion with Rome during the reign of Mary I of England. Her death marked the end of Catholic attempts to reconcile by law the English Church to Rome. Subsequently, Pope Pius V's excommunication of Elizabeth I of England in 1570 and authorisation of rebellion against her contributed to official suspicion of the allegiances of English Catholics. This, combined with a desire to assert the claims of the established church, led to the promulgation of restrictive laws against their civil and religious rights. Elizabethan era restrictions were only relieved through several legislative reforms in the 19th century, cumulatively known as Catholic emancipation. The last restriction on Catholics preventing them from marrying into the royal family remains in effect.
In 1896 Pope Leo XIII issued Apostolicae curae rejecting the Anglo-Catholic claims of the Oxford Movement and the Chicago-Lambeth Quadrilateral such as apostolic succession. In it Leo XIII declared Anglican orders "absolutely null and utterly void." The official reply of the Archbishops of the Church of England was Saepius officio. The judgment remain in effect to the present. The judgement of nullity was reaffirmed in 1998 by the Congregation for the Doctrine of the Faith, when it gave Apostolicae curae as an example of the authoritative teaching of the Catholic Church.
Some attempts at dialogue began in 1915, when Pope Benedict XV approved a British Legation to the Vatican, led by an Anglican with a Catholic deputy. However, discussion of potential reunion in the Malines Conversations eventually collapsed in 1925. Continued efforts resulted in the spread of the Week of Prayer for Christian Unity in both churches (and others), and the visit of George Bell, Bishop of Chichester, to Cardinal Giovanni Montini of Milan in 1955.
Post–Second Vatican Council developments
Real rapprochement was achieved under the leadership of Pope John XXIII, whose foundation of the "Secretariat for the Promotion of Christian Unity" encouraged Archbishop Geoffrey Fisher to make a historic, though not entirely official, visit to the Vatican in 1960. Subsequently the Bishop of Ripon, John Moorman, led a delegation of Anglican observers to the Second Vatican Council. In 1966, Archbishop Michael Ramsey made an official visit to Pope Paul VI, and in the following year, the Anglican–Roman Catholic International Commission (ARCIC) was established. Its first project focused on the authority of Scripture, and the Commission has since produced nine agreed statements. Phase One of ARCIC ended in 1981 with the publication of a final report, Elucidations on Authority in the Church. Phase Two has been ongoing since 1983. The most recent agreed statement dealt with Marian theology, and was published in 2004.
Paul VI went so far as to refer to the Anglican Church as "our beloved sister Church", though this description might not tie in with present thinking in the Vatican. Until recently it was used the website of the Roman Catholic Ampleforth College (referring to Anglican pupils at that school).
"Given the significant extent of our common understanding of the Eucharist [...] and the central importance of the Eucharist to our faith," ARCIC wrote in a non-authoritative statement, Growing together in unity and mission (GTUM), that, "we encourage attendance at each other's Eucharists, respecting the different disciplines of our churches."(n101)[c] GTUM suggests that "We encourage Anglicans and Roman Catholics to pray for the local bishop of the other church as well as for their own bishop, and for God's blessing on their co-operation where possible in their leadership of the local churches' mission. We welcome the growing Anglican custom of including in the prayers of the faithful a prayer for the pope, and we invite Roman Catholics to pray regularly in public for the Archbishop of Canterbury and the leaders of the Anglican Communion."(n103) Since both mutually recognize their administration of baptism, GTUM suggests that "a number of practical initiatives are possible. Local churches may consider developing joint programmes for the formation of families when they present children for baptism, as well as preparing common catechetical resources for use in baptismal and confirmation preparation and in Sunday schools. We suggest that our local parishes regularly make a public profession of faith together, perhaps by renewing baptismal promises at Pentecost each year. We invite local churches to use the same baptismal certificate, and, where necessary, to review and improve those currently in use. While respecting current canonical requirements, we also encourage the inclusion of witnesses from the other church at baptisms and confirmations, particularly in the case of candidates from interchurch families."(n100)
Despite the productivity of these discussions, dialogue is strained by the developments in some provinces of the Anglican Communion of the ordination of women, of permissive teaching on abortion, and of the ordination of those in public same-sex sexual relationships as priests and, in one case, a bishop (Gene Robinson). More progress has been made with respect to Anglican churches outside the Communion.
Cardinal Walter Kasper, president of the Pontifical Council for Promoting Christian Unity, warned that if the Church of England was to ordain women as bishops, as the Episcopal Church has done, then it could destroy any chance of reuniting the Anglican and Catholic Churches. Although ARCIC had completed a major document on Marian theology in 2003, John Paul II temporarily called off all future talks between the Catholic Church and the Anglican Communion after the consecration of Gene Robinson as bishop.
John Paul II made Pastoral Provision for Anglican congregations which as a whole wish to enter into full communion with the Holy See. There has been only a small number of Anglican Use parishes, all of which are in the United States. These are Roman Catholic parishes which are allowed to retain some features of the Book of Common Prayer in worship. Additionally, one of the Continuing Anglican Churches attempted to achieve the recognition of Rome without abandoning its liturgical traditions, as the Anglican Use parishes have done.
According to canon 844 of the 1983 Code of Canon Law of the Latin Church, Catholics should not receive communion from an Anglican minister and Catholic ministers could administer to an Anglican the sacraments of Eucharist, Penance and Anointing of the Sick, only in danger of death or some other grave and pressing need, and provided the Anglican in question cannot approach an Anglican priest, spontaneously asks for the sacrament, demonstrates the faith of the Catholic Church in respect of the sacrament and is properly disposed (canon 844 §4).
In October 2009, the Congregation for the Doctrine of the Faith announced Pope Benedict XVI's intention to create a new type of ecclesiastical structure, called a personal ordinariate, for groups of Anglicans entering into full communion with the see of Rome. The plan would create diocese-like structures for former Anglicans within the Roman Catholic Church independent of existing Latin Rite dioceses. It would allow them to preserve elements of Anglican liturgy, spirituality and religious practice, including married priests but not married bishops. Anglicanorum coetibus was issued on 4 November 2009.
Disciples of Christ
The Lutheran–Roman Catholic dialogue began over thirty years ago, and has consisted of eleven rounds of discussion. The most recent discussion has focused on doctrines associated with eternal life. The dialogue process has produced one major joint declaration, concerning the doctrine of justification, issued in 1999 called the Joint Declaration on the Doctrine of Justification.
Old Catholic Churches
The Old Catholic Archdiocese of Utrecht was formed in 1703,[disputed ] in the area occupied by the historical Roman Catholic Archdiocese of Utrecht, which had been canonically suppressed in response to the Protestant Reformation in 1580 and superseded by the Dutch Mission erected in 1592.
After 1870 several German-speaking Catholics left the Catholic Church in light of the First Vatican Council. Many aligned themselves with the independent Bishop of Utrecht, who ordained clergy among them to form the Old Catholic Churches. Though it is not in communion, the Catholic Church recognizes as valid the Old Catholic holy orders and apostolic succession, however does not recognize their ordinations of women to the priesthood begun in the 1970s. The Old Catholic Churches consider themselves to be in full communion with the Anglican Communion.
The Polish National Catholic Church ceased intercommunion with both the Anglican Communion in 1978, and the Union of Utrecht member churches in 1996, disagreeing over the issue of female ordination. It has since become closer to Rome, which recognizes it to have a similar status as the Orthodox Churches.
- 1274 Council of Lyons, Session IV: Declaration of Union with the Greek Churches
- 1439 Council of Basle-Ferrara-Florence, Laetentur Coeli: Bull of Union with the Greeks
- 1964 Second Vatican Council, Lumen Gentium: Dogmatic Constitution on the Church
- 1964 Second Vatican Council, Unitatis Redintegratio: Decree on Ecumenism
- 1928 Mortalium animos
- 1950 Humani generis
- 1993 Directory for the Application of Principles and Norms on Ecumenism
- 1995 The Ecumenical Dimension in the Formation of Those Engaged in Pastoral Work
- 2000 Dominus Iesus
Some elements of the Roman Catholic perspective on ecumenism are illustrated in the following quotations from the Second Vatican Council's 1964 Unitatis Redintegratio (UR) and John Paul II's 1995 encyclical, Ut unum sint (UUS).
Every renewal of the Church is essentially grounded in an increase of fidelity to her own calling. Undoubtedly this is the basis of the movement toward unity ... There can be no ecumenism worthy of the name without a change of heart. For it is from renewal of the inner life of our minds, from self-denial and an unstinted love that desires of unity take their rise and develop in a mature way. We should therefore pray to the Holy Spirit for the grace to be genuinely self-denying, humble. gentle in the service of others, and to have an attitude of brotherly generosity towards them. ... The words of St. John hold good about sins against unity: "If we say we have not sinned, we make him a liar, and his word is not in us". So we humbly beg pardon of God and of our separated brethren, just as we forgive them that trespass against us. (UR, 6-7)
Christians cannot underestimate the burden of long-standing misgivings inherited from the past, and of mutual misunderstandings and prejudices. Complacency, indifference and insufficient knowledge of one another often make this situation worse. Consequently, the commitment to ecumenism must be based upon the conversion of hearts and upon prayer, which will also lead to the necessary purification of past memories. With the grace of the Holy Spirit, the Lord's disciples, inspired by love, by the power of the truth and by a sincere desire for mutual forgiveness and reconciliation, are called to re-examine together their painful past and the hurt which that past regrettably continues to provoke even today. (UUS, 2)
In ecumenical dialogue, Catholic theologians standing fast by the teaching of the Church and investigating the divine mysteries with the separated brethren must proceed with love for the truth, with charity, and with humility. When comparing doctrines with one another, they should remember that in Catholic doctrine there exists a "hierarchy" of truths, since they vary in their relation to the fundamental Christian faith. Thus the way will be opened by which through fraternal rivalry all will be stirred to a deeper understanding and a clearer presentation of the unfathomable riches of Christ (UR, 11)
The unity willed by God can be attained only by the adherence of all to the content of revealed faith in its entirety. In matters of faith, compromise is in contradiction with God who is Truth. In the Body of Christ, "the way, and the truth, and the life" (Jn 14:6), who could consider legitimate a reconciliation brought about at the expense of the truth?...Even so, doctrine needs to be presented in a way that makes it understandable to those for whom God himself intends it. (UUS, 18-19)
When the obstacles to perfect ecclesiastical communion have been gradually overcome, all Christians will at last, in a common celebration of the Eucharist, be gathered into the one and only Church in that unity which Christ bestowed on His Church from the beginning. We believe that this unity subsists in the Catholic Church as something she can never lose, and we hope that it will continue to increase until the end of time. (UR, 4)
- The report contains unofficial suggestions of the commission, "until the competent organs of the Catholic Church and of the Orthodox Churches express their judgement in regard to it."
- The report showed how some Western "universal values of freedom of conscience could offend the Orthodox who are less concerned by the rights of the individual than the rights of the community and tradition." For example, the phrase "the right of each person to join the religion of his choice" was removed in the final version of paragraph 27 in the report.
- GTUM cites the Directory for the application of principles and norms on ecumenism which cites the Catholic Church canon laws which define the licit administration and reception of certain sacraments of the Catholic Church in normative and in particular exceptional circumstances contained within 1983 Code of Canon Law canon 844, which pertains only to the Latin Church, and the parallel 1990 Code of Canons of the Eastern Churches canon 671, which pertains to the other sui iuris Churches which collectively make up the Eastern Catholic Churches in the Catholic Church.(nn129–32)(note 178)
- "Unitatis Redintegratio". The Holy See. Vatican II. Retrieved 9 August 2016.
- "Directory for the Application of Principles and Norms on Ecumenism". The Holy See. Pontifical Council for Promoting Christian Unity. Retrieved 9 August 2016.
- Granfield/Doyle, Patrick/Denis (2003). "Ecclesiology" in The New Catholic Encyclopedia, Vol. 5 (2nd ed.). The Catholic University of America. p. 40. ISBN 0-7876-4009-3.
- "Lumen Gentium 8". The Holy See. Vatican II.
- One or more of the preceding sentences incorporates text from a publication now in the public domain: Smith, Sydney (1912). "Union of Christendom". In Herbermann, Charles. Catholic Encyclopedia. 15. New York: Robert Appleton.
- Encyclical Ad Petri cathedram
- Catholic Church. Pontifical Council for Promoting Christian Unity (1993-03-25). Directory for the application of principles and norms on ecumenism. Retrieved 2014-01-23 – via vatican.va.
- Mar Dinkha IV; Pope John Paul II (1994-11-11). "Common Christological declaration between the Catholic Church and the Assyrian Church of the East". vatican.va.
- "Assyrian bishop explains his journey into communion with the Catholic Church". Catholic News Agency. 5 June 2008. Retrieved 9 August 2016.
- "Mar Bawai group joins the Chaldean Church". Christians of Iraq. 17 January 2008. Retrieved 9 August 2016.
- Joint International Commission for the Theological Dialogue between the Roman Catholic Church and the Orthodox Church (1993-06-24). Written at Balamand, LB. Uniatism, method of union of the past, and the present search for full communion. 7th plenary session, June 17–24, 1993. Vatican City. Archived from the original on 2003-12-23.
- Bremer, Thomas (2014). "The Greek Catholic churches in post-war Catholic-Orthodox relations". In Leustean, Lucian N. Eastern Christianity and politics in the twenty-first century. Routledge contemporary Russia and Eastern Europe. 54. New York [u.a.]: Routledge. pp. 745–747. ISBN 9780415684903.
- Cassidy, Edward I. (2007). " 'Unitatis redintegratio' forty years after the Council". Gregorianum. Rome: Gregorian Biblical Press. 88 (2): 322–323. ISSN 0017-4114. JSTOR 23582467.
- Nichols, Aidan (2010). Rome and the Eastern Churches: a study in schism (2nd ed.). San Francisco: Ignatius Press. p. 366. ISBN 9781586172824.
- Rousselet, Kathy (2000). "The challenges of religious pluralism in Post-Soviet Russia" (PDF). International Journal on Multicultural Societies. Paris: UNESCO. 2 (2): 69. ISSN 1817-4574. Archived (PDF) from the original on 2007-01-19.
- Baptism, Eucharist and Ministry
- Commentary on Ad tuendam fidem, 11g
- Longenecker, Dwight. "Catholics and Anglicans". dwightlongenecker.com. Greenville, SC. Archived from the original on 2003-10-04. First published in ['[Inside the Vatican]].
- Anglican–Roman Catholic International Commission (2007). "Growing together in unity and mission: building on 40 years of Anglican-Roman Catholic dialogue". vatican.va. Retrieved 2015-04-15.
Discipline in the Catholic Church is set out in the Ecumenical Directory, nn.129–32; Anglican discipline varies from province to province.
- "Bishops Urge Catholics to Attend Anglican Eucharists". The Catholic Herald. 23 February 2007. Retrieved 15 April 2015. (subscription required (. ))
- Challenges lie ahead for Episcopal Church in U.S., url accessed 6/26/06
- Telegraph Newspaper article on the breaking off of Catholic-Anglican ecumenical dialogue following the Gene Robinson consecration.
- "Pope Benedict approves structure for admitting large groups of Anglicans into Catholic Church". Catholic News Agency. Retrieved 2009-10-22.
- McNamara, Edward (2012-02-14). "The Old Catholic and Polish National Churches". ewtn.com. Irondale, AL: Eternal Word Television Network. Retrieved 2015-01-04. Republished from "The Old Catholic and Polish National Churches". zenit.org. Rome. Archived from the original on 2015-01-05.
- "Archdiocese of Utrecht". Catholic-Hierarchy.org. David M. Cheney. Retrieved 2014-01-14.
- "Mission "Sui Iuris" of Batavia (Holland Mission)". Catholic-Hierarchy.org. David M. Cheney. Retrieved 2014-01-14.