The Week of Prayer for Christian Unity has a history of over 100 years , in which Christians around the world have taken part in an octave of prayer for visible Christian unity. By annually observing the WPCU, Christians move toward the fulfillment of Jesus' prayer at the Last Supper "that they all may be one." (cf. John 17:21)
In preparation for the WPCU, ecumenical partners in a particular region were asked to prepare a basic text on a biblical theme. Then an international group organized through the World Council of Churches (WCC) and The Pontifical Council for Promoting Christian Unity edited this text, which was jointly published by the Pontifical Council for Promoting Christian Unity and WCC, through theirCommission on Faith and Order. The WCC accompanied the entire production process of the text. The final material was sent to member churches and Roman Catholic dioceses, and they were invited to translate the text and contextualize it for their own use.