Redemptoris Mater §29

²⁹ "In all of Christ's disciples the Spirit arouses the desire to be peacefully united, in the manner determined by Christ, as one flock under one shepherd." The journey of the Church, especially in our own time, is marked by the sign of ecumenism: Christians are seeking ways to restore that unity which Christ implored from the Father for his disciples on the day before his Passion: "That they may all be one; even as you, Father, are in me, and I in you that they also may be in us, so that the world may believe that you have sent me" (Jn. 17:21). The unity of Christ's disciples, therefore, is a great sign given in order to kindle faith in the world while their division constitutes a scandal. The ecumenical movement, on the basis of a clearer and more widespread awareness of the urgent need to achieve the unity of all Christians, has found on the part of the Catholic Church its culminating expression in the work of the Second Vatican Council: Christians must deepen in themselves and each of their communities that "obedience of faith" of which Mary is the first and brightest example. And since she "shines forth on earth,...as a sign of sure hope and solace for the pilgrim People of God," "it gives great joy and comfort to this most holy Synod that among the divided brethren, too, there are those who live due honor to the Mother of our Lord and Savior. This is especially so among the Easterners."