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Pope John Paul II listens as the Rev. Philip Potter, general secretary of the World Council of Churches, speaks during the pope's visit to the WCC in Geneva June 12, 1984. Also pictured is Metropolitan Emilianos Timiades, right. Pope Francis is scheduled to attend an ecumenical prayer service and meeting at the WCC during a one-day visit to Geneva June 21. (CNS/Peter Williams, courtesy of World Council of Churches)