Vatican II Opens the Catholic Church to Ecumenism
Rome calls the restoration of Christian unity one of the council's principal concerns, reversing centuries of separation
Quick facts
- Council
- Second Vatican Council, 1962-1965 CE
- Decree
- Unitatis Redintegratio, promulgated November 21, 1964
- Vote
- 2,137 to 11
- Paired document
- Nostra Aetate (on non-Christian religions)
What happened
The Second Vatican Council, meeting in Rome from 1962 to 1965 CE under Popes John XXIII and Paul VI, issued a decree on ecumenism, Unitatis Redintegratio, on November 21, 1964 CE, passed by a vote of 2,137 to 11 among the assembled bishops. The decree opened by stating that the restoration of unity among all Christians is one of the principal concerns of the Second Vatican Council, acknowledging that many communions now claim to be the authentic heirs of Jesus Christ and treating this division as a wound working against the church's own mission rather than as simply the fault of those outside it. The council paired this decree with Nostra Aetate, addressing the church's relationship to non-Christian religions, and both documents marked a significant shift from the Council of Trent's more confrontational posture four centuries earlier.
Why it matters
Vatican II's turn toward ecumenism reframed centuries of division, including the Great Schism of 1054 and the Reformation, as problems the Catholic Church itself had a responsibility to help heal rather than disputes settled permanently by earlier councils, and it opened decades of formal dialogue between Catholic, Orthodox, and Protestant churches that continues today.
How we know
Unitatis Redintegratio is published as an official conciliar document on the Vatican's own archive, the primary record of what the council actually decreed rather than a later summary of it.
Sources
- Orthodox Church in America. The Great Schism · Primary source (author-declared)oca.org · Cited as a "primary" source (no stronger domain match).
- The Holy See. Unitatis Redintegratio (Decree on Ecumenism) · Primary source (author-declared)vatican.va · Cited as a "primary" source (no stronger domain match). · Link is live and its text matches the event's key terms (Jul 2026)
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