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Relevant here: DECREE ON ECUMENISM UNITATIS REDINTEGRATIO

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I. The Special Consideration of the Eastern Churches

14. For many centuries the Church of the East and that of the West each followed their separate ways though linked in a brotherly union of faith and sacramental life; the Roman See by common consent acted as guide when disagreements arose between them over matters of faith or discipline. Among other matters of great importance, it is a pleasure for this Council to remind everyone that there flourish in the East many particular or local Churches, among which the Patriarchal Churches hold first place, and of these not a few pride themselves in tracing their origins back to the apostles themselves. Hence a matter of primary concern and care among the Easterns, in their local churches, has been, and still is, to preserve the family ties of common faith and charity which ought to exist between sister Churches.

Similarly it must not be forgotten that from the beginning the Churches of the East have had a treasury from which the Western Church has drawn extensively-in liturgical practice, spiritual tradition, and law. Nor must we undervalue the fact that it was the ecumenical councils held in the East that defined the basic dogmas of the Christian faith, on the Trinity, on the Word of God Who took flesh of the Virgin Mary. To preserve this faith these Churches have suffered and still suffer much.

However, the heritage handed down by the apostles was received with differences of form and manner, so that from the earliest times of the Church it was explained variously in different places, owing to diversities of genius and conditions of life. All this, quite apart from external causes, prepared the way for decisions arising also from a lack of charity and mutual understanding.

For this reason the Holy Council urges all, but especially those who intend to devote themselves to the restoration of full communion hoped for between the Churches of the East and the Catholic Church, to give due consideration to this special feature of the origin and growth of the Eastern Churches, and to the character of the relations which obtained between them and the Roman See before separation. They must take full account of all these factors and, where this is done, it will greatly contribute to the dialogue that is looked for.

15. Everyone also knows with what great love the Christians of the East celebrate the sacred liturgy, especially the eucharistic celebration, source of the Church's life and pledge of future glory, in which the faithful, united with their bishop, have access to God the Father through the Son, the Word made flesh, Who suffered and has been glorified, and so, in the outpouring of the Holy Spirit, they enter into communion with the most holy Trinity, being made "sharers of the divine nature".(35) Hence, through the celebration of the Holy Eucharist in each of these churches, the Church of God is built up and grows in stature(36) and through concelebration, their communion with one another is made manifest.

In this liturgical worship, the Christians of the East pay high tribute, in beautiful hymns of praise, to Mary ever Virgin, whom the ecumenical Council of Ephesus solemnly proclaimed to be the holy Mother of God, so that Christ might be acknowledged as being truly Son of God and Son of Man, according to the Scriptures. Many also are the saints whose praise they sing, among them the Fathers of the universal Church.

These Churches, although separated from us, yet possess true sacraments and above all, by apostolic succession, the priesthood and the Eucharist, whereby they are linked with us in closest intimacy. Therefore some worship in common (communicatio in sacris), given suitable circumstances and the approval of Church authority, is not only possible but to be encouraged.

Moreover, in the East are found the riches of those spiritual traditions which are given expression especially in monastic life. There from the glorious times of the holy Fathers, monastic spirituality flourished which, then later flowed over into the Western world, and there provided the source from which Latin monastic life took its rise and has drawn fresh vigor ever since. Catholics therefore are earnestly recommended to avail themselves of the spiritual riches of the Eastern Fathers which lift up the whole man to the contemplation of the divine.

The very rich liturgical and spiritual heritage of the Eastern Churches should be known, venerated, preserved and cherished by all. They must recognize that this is of supreme importance for the faithful preservation of the fullness of Christian tradition, and for bringing about reconciliation between Eastern and Western Christians.

16. Already from the earliest times the Eastern Churches followed their own forms of ecclesiastical law and custom, which were sanctioned by the approval of the Fathers of the Church, of synods, and even of ecumenical councils. Far from being an obstacle to the Church's unity, a certain diversity of customs and observances only adds to her splendor, and is of great help in carrying out her mission, as has already been stated. To remove, then, all shadow of doubt, this holy Council solemnly declares that the Churches of the East, while remembering the necessary unity of the whole Church, have the power to govern themselves according to the disciplines proper to them, since these are better suited to the character of their faithful, and more for the good of their souls. The perfect observance of this traditional principle not always indeed carried out in practice, is one of the essential prerequisites for any restoration of unity.

17. What has just been said about the lawful variety that can exist in the Church must also be taken to apply to the differences in theological expression of doctrine. In the study of revelation East and West have followed different methods, and have developed differently their understanding and confession of God's truth. It is hardly surprising, then, if from time to time one tradition has come nearer to a full appreciation of some aspects of a mystery of revelation than the other, or has expressed it to better advantage. In such cases, these various theological expressions are to be considered often as mutually complementary rather than conflicting. Where the authentic theological traditions of the Eastern Church are concerned, we must recognize the admirable way in which they have their roots in Holy Scripture, and how they are nurtured and given expression in the life of the liturgy. They derive their strength too from the living tradition of the apostles and from the works of the Fathers and spiritual writers of the Eastern Churches. Thus they promote the right ordering of Christian life and, indeed, pave the way to a full vision of Christian truth.

All this heritage of spirituality and liturgy, of discipline and theology, in its various traditions, this holy synod declares to belong to the full Catholic and apostolic character of the Church. We thank God that many Eastern children of the Catholic Church, who preserve this heritage, and wish to express it more faithfully and completely in their lives, are already living in full communion with their brethren who follow the tradition of the West.

18. After taking all these factors into consideration, this Sacred Council solemnly repeats the declaration of previous Councils and Roman Pontiffs, that for the restoration or the maintenance of unity and communion it is necessary "to impose no burden beyond what is essential".(37) It is the Council's urgent desire that, in the various organizations and living activities of the Church, every effort should be made toward the gradual realization of this unity, especially by prayer, and by fraternal dialogue on points of doctrine and the more pressing pastoral problems of our time. Similarly, the Council commends to the shepherds and faithful of the Catholic Church to develop closer relations with those who are no longer living in the East but are far from home, so that friendly collaboration with them may increase, in the spirit of love, to the exclusion of all feeling of rivalry or strife. If this cause is wholeheartedly promoted, the Council hopes that the barrier dividing the Eastern Church and Western Church will be removed, and that at last there may be but the one dwelling, firmly established on Christ Jesus, the cornerstone, who will make both one.(38)

II. Separated Churches and Ecclesial Communities in the West

19. In the great upheaval which began in the West toward the end of the Middle Ages, and in later times too, Churches and ecclesial Communities came to be separated from the Apostolic See of Rome. Yet they have retained a particularly close affinity with the Catholic Church as a result of the long centuries in which all Christendom lived together in ecclesiastical communion.

However, since these Churches and ecclesial Communities, on account of their different origins, and different teachings in matters of doctrine on the spiritual life, vary considerably not only with us, but also among themselves, the task of describing them at all adequately is extremely difficult; and we have no intention of making such an attempt here.

Although the ecumenical movement and the desire for peace with the Catholic Church have not yet taken hold everywhere, it is our hope that ecumenical feeling and mutual esteem may gradually increase among all men.

It must however be admitted that in these Churches and ecclesial Communities there exist important differences from the Catholic Church, not only of an historical, sociological, psychological and cultural character, but especially in the interpretation of revealed truth. To make easier the ecumenical dialogue in spite of these differences, we wish to set down some considerations which can, and indeed should, serve as a basis and encouragement for such dialogue.

20. Our thoughts turn first to those Christians who make open confession of Jesus Christ as God and Lord and as the sole Mediator between God and men, to the glory of the one God, Father, Son and Holy Spirit. We are aware indeed that there exist considerable divergences from the doctrine of the Catholic Church concerning Christ Himself, the Word of God made flesh, the work of redemption, and consequently, concerning the mystery and ministry of the Church, and the role of Mary in the plan of salvation. But we rejoice to see that our separated brethren look to Christ as the source and center of Church unity. Their longing for union with Christ inspires them to seek an ever closer unity, and also to bear witness to their faith among the peoples of the earth.

21. A love and reverence of Sacred Scripture which might be described as devotion, leads our brethren to a constant meditative study of the sacred text. For the Gospel "is the power of God for salvation to every one who has faith, to the Jew first and then to the Greek".(39)

While invoking the Holy Spirit, they seek in these very Scriptures God as it were speaking to them in Christ, Whom the prophets foretold, Who is the Word of God made flesh for us. They contemplate in the Scriptures the life of Christ and what the Divine Master taught and did for our salvation, especially the mysteries of His death and resurrection.

But while the Christians who are separated from us hold the divine authority of the Sacred Books, they differ from ours-some in one way, some in another-regarding the relationship between Scripture and the Church. For, according to Catholic belief, the authentic teaching authority of the Church has a special place in the interpretation and preaching of the written word of God.

But Sacred Scriptures provide for the work of dialogue an instrument of the highest value in the mighty hand of God for the attainment of that unity which the Saviour holds out to all.

22. Whenever the Sacrament of Baptism is duly administered as Our Lord instituted it, and is received with the right dispositions, a person is truly incorporated into the crucified and glorified Christ, and reborn to a sharing of the divine life, as the Apostle says: "You were buried together with Him in Baptism, and in Him also rose again-through faith in the working of God, who raised Him from the dead".(40)

Baptism therefore establishes a sacramental bond of unity which links all who have been reborn by it. But of itself Baptism is only a beginning, an inauguration wholly directed toward the fullness of life in Christ. Baptism, therefore, envisages a complete profession of faith, complete incorporation in the system of salvation such as Christ willed it to be, and finally complete ingrafting in eucharistic communion.

Though the ecclesial Communities which are separated from us lack the fullness of unity with us flowing from Baptism, and though we believe they have not retained the proper reality of the eucharistic mystery in its fullness, especially because of the absence of the sacrament of Orders, nevertheless when they commemorate His death and resurrection in the Lord's Supper, they profess that it signifies life in communion with Christ and look forward to His coming in glory. Therefore the teaching concerning the Lord's Supper, the other sacraments, worship, the ministry of the Church, must be the subject of the dialogue.

23. The daily Christian life of these brethren is nourished by their faith in Christ and strengthened by the grace of Baptism and by hearing the word of God. This shows itself in their private prayer, their meditation on the Bible, in their Christian family life, and in the worship of a community gathered together to praise God. Moreover, their form of worship sometimes displays notable features of the liturgy which they shared with us of old.

Their faith in Christ bears fruit in praise and thanksgiving for the blessings received from the hands of God. Among them, too, is a strong sense of justice and a true charity toward their neighbor. This active faith has been responsible for many organizations for the relief of spiritual and material distress, the furtherance of the education of youth, the improvement of the social conditions of life, and the promotion of peace throughout the world.

While it is true that many Christians understand the moral teaching of the Gospel differently from Catholics, and do not accept the same solutions to the more difficult problems of modern society, nevertheless they share our desire to stand by the words of Christ as the source of Christian virtue, and to obey the command of the Apostle: "And whatever you do, in word or in work, do all in the name of the Lord Jesus Christ, giving thanks to God the Father through Him".(41) For that reason an ecumenical dialogue might start with discussion of the application of the Gospel to moral conduct.

24. Now that we have briefly set out the conditions for ecumenical action and the principles by which it is to be directed, we look with confidence to the future. This Sacred Council exhorts the faithful to refrain from superficiality and imprudent zeal, which can hinder real progress toward unity. Their ecumenical action must be fully and sincerely Catholic, that is to say, faithful to the truth which we have received from the apostles and Fathers of the Church, in harmony with the faith which the Catholic Church has always professed, and at the same time directed toward that fullness to which Our Lord wills His Body to grow in the course of time.

It is the urgent wish of this Holy Council that the measures undertaken by the sons of the Catholic Church should develop in conjunction with those of our separated brethren so that no obstacle be put in the ways of divine Providence and no preconceived judgments impair the future inspirations of the Holy Spirit. The Council moreover professes its awareness that human powers and capacities cannot achieve this holy objective-the reconciling of all Christians in the unity of the one and only Church of Christ. It is because of this that the Council rests all its hope on the prayer of Christ for the Church, on our Father's love for us, and on the power of the Holy Spirit. "And hope does not disappoint, because God's love has been poured into our hearts through the Holy Spirit, who has been given to us".(42)

Each and all these matters which are set forth in this Decree have been favorably voted on by the Fathers of the Council. And We, by the apostolic authority given Us by Christ and in union with the Fathers, approve, decree and establish them in the Holy Spirit and command that they be promulgated for the glory of God.