[3] Pope Pius X officially blessed the concept, and Benedict XV "encouraged its observance throughout the entire Roman Catholic Church."[4] Protestant leaders in the mid-1920s also proposed an annual octave of prayer for unity amongst Christians, leading up to Pentecost Sunday (the traditional commemoration of the establishment of the Church).The year 1968 saw the first official use of materials prepared jointly by the Faith and Order Commission and the Pontifical Council for Promoting Christian Unity, representing the entire Catholic Church.[9] The 2016 Week was provided by the Churches of Latvia,[10] and the theme was that all Christians are 'Called to proclaim the mighty acts of the Lord' (indirectly referring to 1 Peter 2:9).[12] The 2024 week of prayer draws together churches across the globe under the theme "You shall love the Lord your God ... and your neighbour as yourself" (Luke 10:27) with materials prepared by an ecumenical team from Burkina Faso, facilitated by the local Chemin Neuf Community (CCN).