In later centuries the word ecumenical was used to denote church councils (e.g., Nicaea, Chalcedon) whose decisions represented the universal church, in contrast to other councils that enjoyed only regional or limited reception. The honorary title of ecumenical patriarch was given to the Greek Orthodox patriarch of Constantinople in the 6th century because his see was located in the capital of the oikoumenē and his leadership was accepted as primus inter pares (first among equals) in the faith and mission of the whole church. The Apostles’, Nicene, and Athanasian creeds are called ecumenical because they witness to the faith of all Christians. Since the 19th century the term ecumenism has denoted the movement of the renewal, unity, and mission of Christians and churches of different traditions “so that the world may believe.”
Ecumenism is a vision, a movement, a theology, and a mode of action. It represents the universality of the people of God and affects the way Christians think about their faith, the church, and the world. Ecumenism is a long process that draws Christians together, uniting their life and mission and bringing the Body of Christ and the human community closer to the fulfillment of God’s purposes. Those involved in ecumenism participate in ideas, activities, and institutions that express a spiritual reality of shared love in the church and the human community. Ecumenism is characterized by the work of officially organized ecumenical bodies, the confessing and witnessing of Christians in local places, and the spirituality and actions of those who live together in love and prophetic proclamation. Far more than a program or an organization, ecumenism is, according to the British ecumenist Oliver S. Tomkins, “something that happens to the soul of Christians.”
Any unity worthy of this vision cannot be identified with political or spiritual coercion, strategies of dominance or superiority, calls for “a return to the mother church,” or expectations of monolithic uniformity or a super-church. The weapons of faith are not those of force or intolerance, and neither can divisions be overcome nor authentic unity manifested by syncretism, a least-common-denominator theology, or a casual friendliness. Ecumenism accepts the diversity of God’s people, given in creation and redemption, and strives to bring these confessional, cultural, national, and racial differences into one fully committed fellowship.
Ultimately, the purpose of ecumenism is to glorify the triune God and to help the one missionary church to witness effectively and faithfully among all peoples and nations. In the second half of the 20th century, Christians began confessing new dimensions of this vocation, especially in relation to what divides the churches. Progress was made on historical theological issues that have divided Christians through the centuries—baptism, the Eucharist, and ministry. But equally divisive among Christians are the divisions of the human family: racism, poverty, sexism, war, injustice, and differing ideologies. These issues are part of the agenda of ecumenism and bring a particular context, dynamic spirit, and urgency to the pursuit of Christian unity as well as of justice and peace. The church’s unity becomes essential for the renewal and unity of the human family. Through its unity the church becomes a sign, the first fruits of the promised unity and peace among God’s peoples and the nations. The biblical perspective
The unity of the church and of all creation is a dominant motif in the Bible. This witness begins in the Old Testament (Hebrew Scriptures), not the New Testament. As attested in the Bible, God established a covenant with the Hebrew people and gathered the disparate tribes into one religious nation, Israel, taking steps to overcome the alienation between God and humans and to reconcile God’s people. The tradition of ancient Judaism, therefore, was based on the reality of the one people of God. Their unity was an expression of their monotheistic faith, the oneness of God. According to Genesis, God created the world as one cosmos, an ordered unity determined by one single will in which all creatures are responsive to the purposes of the Creator. God chose Israel from all the nations of the world and entered into a covenant with its people. Whenever men and women sinned and alienated themselves from God and from one another, God acted to bring about their reconciliation. Israel’s mission was to preserve the faithfulness and unity of all God’s people and to prepare them for the realization of the kingdom of God.
The vision of unity is central to the Gospel of Jesus Christ and the teachings of his Apostles. Those who confess Jesus as Lord and Saviour are brought together in a new community: the church. The New Testament writers assumed that to be “in Christ” is to belong to one fellowship (Greek: koinōnia). Jesus clearly gave the mandate when at the Last Supper he offered his high-priestly intercession, praying that the disciples and all those who believe in him “may all be one. As you, Father, are in me and I am in you…so that the world may believe that you have sent me” (John 17:21). This unity was demonstrated in the miracle of Pentecost (Acts 2) and other actions that established the primitive church—e.g., the epoch-making Council of Jerusalem (Acts 15), which negotiated conflicts between Jewish and Gentile Christians.
The early church nevertheless had many tensions and conflicts that called for ecumenical proclamations and pleas from the Evangelists and Apostles. Tensions arose between Jewish Christian churches and Gentile Christian churches, between St. Paul and the enthusiasts. St. Peter and St. Paul disagreed strongly over whether Gentiles had to fulfill Jewish requirements in order to be welcome at the Lord’s Supper (Eucharist). As revealed in the New Testament, the young church clearly faced the challenge of theological aberrations: Colossians refutes gnosticism; the Johannine Epistles warn against docetism; and 2 Peter and Revelation attack false prophets.
Diversity, however, did not create schism nor allow a break in fellowship. There were no denominations or divided communities, as were to develop later in the church’s history. Division among Christians is a denial of Christ, an unthinkable distortion of the reality of the church. Amid their diversity and conflicts, the early Christians remained of “one accord,” visibly sharing the one Eucharist, accepting the ministries of the whole church, reaching out beyond their local situation in faith and witness with a sense of the universal community that held all Christians together. As St. Paul taught the Ephesians, God’s ultimate will and plan is “to gather up all things in him [Christ], things in heaven and things on earth” (Ephesians 1:10). The history of ecumenism
While unity is given in Christ, two diametric forces appear in the history of the church: one is the tendency toward sectarianism and division; the other is the conviction toward catholicity and unity. Ecumenism represents the struggle between them. Some of the schisms were theological conflicts foreshadowed in the apostolic church; others were internal quarrels related to liturgical differences, power politics between different patriarchates or church centres, problems of discipline and piety, or social and cultural conflicts. Nevertheless, the entire span of the Christian church’s first two millennia may be viewed as a drive to realize the unity of the earliest church. Early controversies