The World Council of Churches (WCC) is a worldwide Christian inter-church organization founded in 1948 to work for the cause of ecumenism. Its full members today include the Assyrian Church of the East, the Oriental Orthodox Churches, most jurisdictions of the Eastern Orthodox Church, the Old Catholic Church, the Lutheran churches, the Anglican Communion, the Mennonite churches, the Methodist churches, the Moravian Church, Mar Thoma Syrian Church and the Reformed churches, as well as the Baptist World Alliance and Pentecostal churches. Notably, the Catholic Church is not a full member, although it sends delegates to meetings who have observer status.
Ecumenism, also spelled oecumenism, is the concept and principle that Christians who belong to different Christian denominations should work together to develop closer relationships among their churches and promote Christian unity. The adjective ecumenical is thus applied to any initiative that encourages greater cooperation and union among Christian denominations and churches.
In Christian theology, ecclesiology is the study of the Church, the origins of Christianity, its relationship to Jesus, its role in salvation, its polity, its discipline, its eschatology, and its leadership.
The Week of Prayer for Christian Unity is an ecumenical Christian observance in the Christian calendar that is celebrated internationally. It is kept annually between Ascension Day and Pentecost in the Southern Hemisphere and between 18 January and 25 January in the Northern Hemisphere. It is an octave, that is, an observance lasting eight days.
The Canadian Council of Churches is a broad and inclusive ecumenical body, now representing 26 member churches including Anglican; Eastern and Roman Catholic; Evangelical; Free Church; Eastern and Oriental Orthodox; and Historic Protestant traditions. Together these member churches represent 13,500 worshiping communities and comprise 85% of the Christians in Canada.
Catholic–Lutheran dialogue is a series of discussions which began during July 1964 as an outgrowth of the Second Vatican Council. These gatherings reflect the new openness of the Roman Catholic Church to dialogue with other Christian denominations as well as other religions. These dialogues have been primarily between by church representatives of the Lutheran World Federation and representatives of the Pontifical Council for Promoting Christian Unity.
Catholicity is a concept pertaining to beliefs and practices that are widely accepted by numerous Christian denominations, most notably by those Christian denominations that describe themselves as catholic in accordance with the Four Marks of the Church, as expressed in the Nicene Creed formulated at the First Council of Constantinople in 381: "[I believe] in one, holy, catholic, and apostolic Church."
The Chicago-Lambeth Quadrilateral, frequently referred to as the Lambeth Quadrilateral or the Lambeth-Chicago Quadrilateral, is a four-point articulation of Anglican identity, often cited as encapsulating the fundamentals of the Anglican Communion's doctrine and as a reference point for ecumenical discussion with other Christian denominations. The four points are:
- The Holy Scriptures, as containing all things necessary to salvation;
- The creeds, as the sufficient statement of Christian faith;
- The dominical sacraments of baptism and Holy Communion;
- The historic episcopate, locally adapted.
The Catholic Church has engaged in the modern ecumenical movement especially since the Second Vatican Council (1962-1965) and the issuing of the decree Unitatis redintegratio and the declaration Dignitatis humanae. It was at the Council that the Pontifical Council for Promoting Christian Unity was created. Those outside of the Catholic Church were categorised as heretics or schismatics, but in many contexts today, in order to avoid offence, the euphemism "separated brethren" is used.
The General Commission on Christian Unity and Interreligious Concerns (GCCUIC) addresses the interreligious and ecumenical concerns of The United Methodist Church. The GCCUIC's office is located at The Interchurch Center in New York City. The Commission's President is Bishop Mary Ann Swenson and the General Secretary is Stephen J. Sidorak Jr. The Ecumenical Officer of the Council of Bishops is Bishop Sharon Zimmerman Rader and serves as the corporate ecumenical officer of The United Methodist Church, working in collaboration with GCCUIC.
Anglican interest in ecumenical dialogue can be traced back to the time of the Reformation and dialogues with both Orthodox and Lutheran churches in the sixteenth century. In the nineteenth century, with the rise of the Oxford Movement, there arose greater concern for reunion of the churches of "Catholic confession". This desire to work towards full communion with other denominations led to the development of the Chicago-Lambeth Quadrilateral, approved by the Third Lambeth Conference of 1888. The four points were stipulated as the basis for church unity, "a basis on which approach may be by God's blessing made towards Home Reunion":
Baptism, Eucharist and Ministry (BEM), also known as the Lima Document, is a Christian ecumenical document adopted by members of the World Council of Churches in Lima in January 1982.
Vilakuvelil Cherian Samuel, called Samuel Achen was an Indian Christian philosopher, scholar, university professor, theologian, historian, polyglot and ecumenical leader. He was a priest of the Indian Orthodox Church. He was the author of many doctrinal books and papers including The Council of Chalcedon Re-Examined: Historical Theological Survey.
Olav Fykse Tveit is a Norwegian Lutheran theologian and bishop, and the current Preses of the Bishops' Conference of the Church of Norway. He was elected to the post of general secretary of the World Council of Churches on 27 August 2009. He entered office on 1 January 2010, for a proposed term of five years, and was re-elected to a second term in July 2014. He resigned from the post in March 2020, having been elected Preses of the Bishops' Conference of the Church of Norway.
Paul David Loup Avis is an English Anglican priest, theologian, and ecumenist. He was General Secretary of the Church of England's Council for Christian Unity from 1998 to 2011, theological consultant to the Anglican Communion Office, London, from 2011 to 2012, and Canon Theologian of Exeter Cathedral from 2008 to 2013. He was honorary professor in the Department of Theology and Religion at Durham University 2017-2021 and Honorary Professor in the School of Divinity, University of Edinburgh 2022-. At the University of Exeter he was visiting professor of theology from 2009 to 2017 and is currently honorary research fellow. He is Director of the Centre for the Study of the Christian Church which organises occasional conferences and is linked to the journal Ecclesiology, published by Brill, of which he is Editor-in-Chief. He is the editor of the series Anglican-Episcopal Theology and History, also published by Brill. Avis was also a chaplain to Queen Elizabeth II, 2008–2017.
James Quinn, SJ was a Scottish Jesuit priest, theologian and hymnodist.
The Liturgy of Addai and Mari is the Eucharistic liturgy belonging to the East Syriac Rite and was historically used in the Church of the East of the Sasanian (Persian) Empire. This liturgy is traditionally attributed to Saint Addai and Saint Mari. It is currently in regular use in the Assyrian Church of the East of Iraq, the Ancient Church of the East of Iraq, the Syro-Malabar Church of India, and the Chaldean Catholic Church of Iraq. The latter two are Eastern Catholic churches in full communion with the Holy See of Rome.
Martha L. Moore-Keish is an American theologian ordained in the Presbyterian Church (U.S.A.). Her work is primarily focused on Reformed theology, liturgical theology and ecumenical theology, including engagement with interfaith issues around the world. She currently engages this work as the J.B. Green Associate Professor of Theology at Columbia Theological Seminary.
Catholic–Eastern Orthodox relations have warmed over the last century, as both churches embrace a dialogue of charity. The Second Vatican Council (1962-1965) ushered in a new era of relations for the Catholic Church towards the Eastern Church, fondly describing the Orthodox as “separated brethren” with valid sacraments and an apostolic priesthood. The Orthodox Church, on the other hand, encouraged local churches to prepare for future dialogue in the Third Pan-Orthodox Conference in Rhodes (1964), and has since engaged in several ecumenical efforts with the Vatican. Significantly, in 1965 Pope Paul VI and Ecumenical Patriarch Athenagoras I of Constantinople mutually lifted their respective excommunications.
The Lima Liturgy is a Christian ecumenical Eucharistic liturgy. It was written for the 1982 Plenary Session of the Faith and Order Commission of the World Council of Churches (WCC) in Lima, Peru and reflects the theological convergences of the meeting's Baptism, Eucharist and Ministry (BEM) document as expressed in liturgy. The liturgy was used again at the closing of a 1982 meeting of the Central Committee of the WCC in Geneva, Switzerland, in 1983 during the Sixth Assembly of the WCC in Vancouver, Canada, in 1991 at the Seventh Assembly of the WCC in Canberra, Australia, and, albeit unofficially, in 1993 at the fifth world conference on Faith and Order in Santiago de Compostela, Spain. Although the Eucharist has not been celebrated at WCC Assemblies after 1991 using the Lima or any other liturgy, the Lima Liturgy has been used in ecumenical events all over the world. For instance, many churches in North America use it on World Communion Sunday.
