Prayer for the Octave of Christian Unity

The Dome at the Birmingham Oratory
Source: Birmingham Oratory

Ut omnes unum sint, sicut tu Pater in me et ego in te; ut mundus credat quia tu me misisti.

V. Tu es Petrus.
R. Et super hanc petram aedificabo ecclesiam meam. 

Oremus: Domine Iesu Christe, qui dixisti Apostolis tuis: pacem relinquo vobis, pacem meam do vobis ne respicias peccata nostra, sed fidem Ecclesie tuae, eamque secundum voluntatem tuam pacificare et coadunare digneris. Qui vivis et regnas in saecula saeculorum.

R. Amen

English translation 

ANTIPHON: That they all may be one, as Thou, Father, in me and I in Thee; that they also may be one in Us; that the world may believe that Thou hast sent me.

V. I say unto thee, thou art Peter;
R. And upon this rock I will build my Church.

[Here is brought to mind the intention for the day's prayer.]

January 18: For the return of the "other sheep" to the One Fold of our Lord Jesus Christ.

January 19: For the return of the Eastern Orthodox Christians to communion with the Apostolic See.

January 20: For the return of the Anglicans to the authority of the Vicar of Christ.

January 21: For the return of all Protestants throughout the world to the unity of the Catholic Church.

January 22: That Christians in America may be one, in union with the Chair of Saint Peter.

January 23: That lapsed Catholics will return to the Sacraments of the Church.

January 24: That the Jewish people will be converted to the Catholic Faith.

January 25: That missionary zeal will conquer the world for Christ.

[The following prayer is then said.]

Let us pray. O Lord Jesus Christ, who saidst unto Thine Apostles: Peace I leave you, My peace I give to you; regard not our sins, but the faith of Thy Church, and grant unto her that peace and unity which are agreeable to Thy Will; Who livest and reignest ever, one God, world without end. Amen.

Source of English Translation