The Week of Prayer for Christian Unity
18 January to 25 January
From USCCB:
Beginning today, the entire Christian community is invited to a week of prayer in communion with each other and Jesus “that they may all be one”. (Jn 17:21) Join us, and Christians around the world, as we pray for Christian unity and work together to bring about justice in the world. More information can be found here.
The traditional period in the northern hemisphere for the Week of Prayer for Christian Unity is January 18 to 25. Those dates were proposed in 1908 by Servant of God, Fr. Paul Wattson, Founder of the Society of the Atonement, to cover the original days of the Feasts of the Chair of St. Peter (January 18) and the Conversion of St. Paul (January 25), and therefore have a symbolic significance. (via Franciscan Friars of the Atonement)
O God, who dost restore them that have gone astray, gather together them that are scattered abroad, and preserve them that thou hast gathered: we beseech thee of the mercy to pour out upon all people the grace of thy communion; that, divisions being done away, they may be one flock, in one fold, under one Shepherd, and do thee worthy service; through Jesus Christ thy Son our Lord, who liveth and reigneth with thee, in the unity of the Holy Spirit, ever one God, world without end. Amen.