1965: Unitatis Redintegratio

CHAPTER II
THE PRACTICE OF ECUMENISM

  1. The attainment of union is the concern of the whole Church, faithful and shepherds alike. This concern extends to everyone, according to his talent, whether it be exercised in his daily Christian life or in his theological and historical research. This concern itself reveals already to some extent the bond of brotherhood between all Christians and it helps toward that full and perfect unity which God in His kindness wills.
  2. Every renewal of the Church(27) is essentially grounded in an increase of fidelity to her own calling. Undoubtedly this is the basis of the movement toward unity.

Christ summons the Church to continual reformation as she sojourns here on earth. The Church is always in need of this, in so far as she is an institution of men here on earth. Thus if, in various times and circumstances, there have been deficiencies in moral conduct or in church discipline, or even in the way that church teaching has been formulated – to be carefully distinguished from the deposit of faith itself – these can and should be set right at the opportune moment.

Church renewal has therefore notable ecumenical importance. Already in various spheres of the Church’s life, this renewal is taking place. The Biblical and liturgical movements, the preaching of the word of God and catechetics, the apostolate of the laity, new forms of religious life and the spirituality of married life, and the Church’s social teaching and activity – all these should be considered as pledges and signs of the future progress of ecumenism.

SOURCE

Unitatis Redintegratio (Vatican)