Wounds to unity
817 In fact, "in this one and only Church of God from its very beginnings there arose certain rifts, which the Apostle strongly censures as damnable. But in subsequent centuries much more serious dissensions appeared and large communities became separated from full communion with the Catholic Church - for which, often enough, men of both sides were to blame."269 The ruptures that wound the unity of Christ's Body - here we must distinguish heresy, apostasy, and schism270 - do not occur without human sin:
Where there are sins, there are also divisions, schisms, heresies, and disputes. Where there is virtue, however, there also are harmony and unity, from which arise the one heart and one soul of all believers.271
818 "However, one cannot charge with the sin of the separation those who at present are born into these communities [that resulted from such separation] and in them are brought up in the faith of Christ, and the Catholic Church accepts them with respect and affection as brothers . . . . All who have been justified by faith in Baptism are incorporated into Christ; they therefore have a right to be called Christians, and with good reason
are accepted as brothers in the Lord by the children of the Catholic Church."272
819 "Furthermore, many elements of sanctification and of truth"273 are found outside the visible confines of the Catholic Church: "the written Word of God; the life of grace; faith, hope, and charity, with the other interior gifts of the Holy Spirit, as well as visible elements."274 Christ's Spirit uses these Churches and ecclesial communities as means of salvation, whose power derives from the fullness of grace and truth that Christ has entrusted to the Catholic Church. All these blessings come from Christ and lead to him,275 and are in themselves calls to "Catholic unity."276
CCC
2. Nevertheless, besides the doctrinal differences needing to be resolved, Christians cannot underestimate the burden of long-standing misgivings inherited from the past, and of mutual misunderstandings and prejudices. Complacency, indifference and insufficient knowledge of one another often make this situation worse. Consequently, the commitment to ecumenism must be based upon the conversion of hearts and upon prayer, which will also lead to the necessary purification of past memories.
With the grace of the Holy Spirit, the Lord's disciples, inspired by love, by the power of the truth and by a sincere desire for mutual forgiveness and reconciliation, are called to [/size]re-examine together their painful past and the hurt which that past regrettably continues to provoke even today. All together, they are invited by the ever fresh power of the Gospel to acknowledge with sincere and total objectivity the mistakes made and the contingent factors at work at the origins of their deplorable divisions.[/size] What is needed is a calm, clear-sighted and truthful vision of things, a vision enlivened by divine mercy and capable of freeing people's minds and of inspiring in everyone a renewed willingness, precisely with a view to proclaiming the Gospel to the men and women of every people and nation.
3. At the Second Vatican Council, the Catholic Church committed herself
irrevocably to following the path of the ecumenical venture, thus heeding the Spirit of the Lord, who teaches people to interpret carefully the "signs of the times" . The experiences of these years have made the Church even more profoundly aware of her identity and her mission in history.
The Catholic Church acknowledges and confesses the weaknesses of her members, conscious that their sins are so many betrayals of and obstacles to the accomplishment of the Saviour's plan. Because she feels herself constantly called to be renewed in the spirit of the Gospel, she does not cease to do penance. At the same time, she acknowledges and exalts still more
the power of the Lord, who fills her with the gift of holiness, leads her forward, and conforms her to his Passion and Resurrection.
Taught by the events of her history, the Church is committed to freeing herself from every purely human support, in order to live in depth the Gospel law of the Beatitudes. Conscious that the truth does not impose itself except "by virtue of its own truth, as it makes its entrance into the mind at once quietly and with power", she seeks nothing for herself but the freedom to proclaim the Gospel. Indeed, her authority is exercised in the service of truth and charity...
UT UNUM SINT on commitment to Ecumenism
Pope Francis Meets With Evangelical, Pentecostal Leaders in John 17 Spirit (Interview)