Speaking of the Week of Prayer for Christian Unity, which begins today and lasts until the 25th, the Pope talked about the value of the prayer initiatives for the Week at the Sunday Angelus Address:

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Every year it constitutes, for believers in Christ, a
propitious time to revive the ecumenical spirit, to meet each other, to get to
know each other, to pray and reflect together. The biblical theme, taken from
the Gospel of St. Luke, echoes the words of the risen Jesus to the apostles:
You are witnesses of these things” (Luke 24:48). Our proclamation of the
Gospel of Jesus will be much more credible and effective the more that we are
united in his love, as true brothers. Thus, I invite parishes, religious
communities, ecclesial movements and associations to pray unceasingly, in a
special way during Eucharistic Celebrations, for the complete unity of