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 divisions 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]