VATICAN CITY - The leader of the World Council of Churches said Thursday he wanted to move beyond a rift between the Roman Catholic Church and other Christians over mutual recognition and welcomed indications from Pope Benedict XVI that he, too, wanted to improve ties.

The Rev. Samuel Kobia, a Methodist pastor and general secretary of the Geneva-based council, said he was encouraged by pledges from the new pope to make improving relations with other Christians and healing the 1,000-year-old rift with the Orthodox Church a "primary" task of his papacy.

In Turkey on Thursday, the spiritual leader of the world's Orthodox Christians, Ecumenical Patriarch Bartholomew I, also welcomed Benedict's outreach but said both sides must be "realistic about the cost and the time involved in this process."

During a meeting with Kobia at the Vatican, Benedict repeated his pledge that "concrete gestures" were necessary to forge unity. "The commitment of the Catholic Church to the search for Christian unity is irreversible," Benedict said.

The World Council of Churches is a fellowship of more than 300 churches from nearly all Christian traditions, including Protestants and the Orthodox. The Roman Catholic Church is not a member but cooperates with it.

Protestants were deeply offended by a 2000 document, "Dominus Iesus," from the Vatican's Congregation for the Doctrine of the Faith that framed the role of the Catholic Church in human salvation in an exclusive manner.

The document, written by Benedict when he was Cardinal Joseph Ratzinger and prefect of the congregation, said non-Catholic or Orthodox "ecclesiastical communities" were "not churches in the proper sense."