¶ The week between the Confession of Saint Peter (January 18th) and the Conversion of Saint Paul (January 25th) is widely (but not universally) observed as a Week of Prayer for Christian Unity.
Vouchsafe, we beseech thee, Almighty God, to grant to the whole Christian people unity, peace, and true concord, both visible and invisible; through Jesus Christ thy Son our Lord, who liveth and reigneth with thee in the unity of the Holy Ghost, ever one God, world without end. Amen.
¶ Or this:
Almighty Father, whose blessed Son before his passion prayed for his disciples that they might be one, even as thou and he are one: Grant that thy Church, being bound together in love and obedience to thee, may be united in one body by the one Spirit, that the world may believe in him whom thou didst send, the same thy Son Jesus Christ our Lord; who liveth and reigneth with thee, in the unity of the same Spirit, one God, now and for ever. Amen.