Concelebration by bishops and presbyters belonging to different Churches sui iuris in the Catholic Church is a distinctive expression of the unity of the Church and of the communion shared among different ecclesial traditions. While each Church sui iuris preserves its own liturgical and canonical heritage, such diversity exists within the communion of the Catholic Church. Therefore, the Code of Canons of the Eastern Churches, particularly c. 701, provides clear guidelines concerning the matters to be observed in concelebration among different Churches sui iuris. For a just cause, especially to foster love and to manifest the unity of the Churches, the law permits such concelebration with the permission of the eparchial bishop and with all following the prescripts of the liturgical books of the principal celebrant. These norms are intended to safeguard both the unity of the Churches and the legitimate diversity of their liturgical traditions. A precise understanding of these norms is essential to ensure that concelebration becomes an authentic manifestation of ecclesial communion without compromising the integrity of the respective liturgical traditions.

The Requirement of a Just Cause:

CCEO c. 701 prescribes that concelebration involving different Churches sui iuris should not become a regular practice without sufficient reason. A just cause is therefore required for such concelebration. This canon points to fostering love and manifesting the unity of the Churches as the principal reasons for it. While respecting the liturgical traditions of the Churches sui iuris taking part, such concelebration becomes a visible expression of ecclesial unity. Such a celebration is entirely consistent with the general principle that concelebration manifests the unity of the priesthood and the sacrifice of Christ (CCEO c. 700 §2).

Permission of the Eparchial Bishop:

Even when there are just causes, the permission of the eparchial bishop is required under CCEO c. 701 for bishops and presbyters belonging to different Churches sui iuris to concelebrate. This requirement helps to ensure that the discipline of the Church and the liturgical norms are observed properly.

The Liturgical Books of the Principal Celebrant:

When presbyters of different Churches sui iuris concelebrate, all are to follow the prescripts of the liturgical books of the principal celebrant (CCEO c. 701). This ensures liturgical unity in the celebration. This does not mean that the proper traditions of the co-celebrants’ Churches are without importance; rather, it means that the common celebration is regulated according to an approved liturgical form.

While the general principle remains that “In celebrating the sacraments, that which is contained in the liturgical books is to be observed accurately” (CCEO c. 674 §1), when presbyters of different Churches sui iuris concelebrate, the co-celebrants must also take care to observe the prescriptions contained in the liturgical books of the principal celebrant.

Avoidance of Liturgical Syncretism:

Concelebration among different Churches sui iuris should never become an occasion for arbitrarily mixing elements from different liturgical traditions. CCEO c. 701 explicitly directs that any liturgical syncretism is to be avoided. The purpose is not to create a new liturgical form, but to manifest communion while preserving the identity of each Church sui iuris.

The Instruction for Applying the Liturgical Prescriptions of the Code of Canons of the Eastern Churches (no. 57) also emphasises the need to respect the diversity of the Eastern Churches. Therefore, unity should be manifested not by eliminating the proper differences, but by participating together in the same Divine Liturgy. Moreover, such a celebration should not cause scandal among the faithful.

Appropriate Liturgical Vestments and Insignia:

When different Churches sui iuris concelebrate, the canon prescribes that the presbyters who are co-celebrants should preferably wear the liturgical vestments and insignia of their own Church sui iuris. These are not merely external ceremonial practices, but symbols of the proper diversity of the Eastern Catholic Churches within the unity of the Catholic Church.

Prohibition of Concelebration with Non-Catholic Priests or Ministers:

A clear distinction must be made between concelebration among Catholic priests and the celebration of the Divine Liturgy together with priests or ministers of Churches that are not in full communion with the Catholic Church. According to CCEO c. 702, Catholic priests are forbidden to concelebrate the Divine Liturgy with non-Catholic priests or ministers.

This prohibition arises from the fact that the celebration of the Divine Liturgy is a sign of full Christian communion. It is not merely a sign of friendship or cooperation, but an expression of full sacramental and ecclesial communion. Therefore, concelebration by those who are not in full communion is, in itself, contradictory to the nature of such a celebration. This principle is also expressed in the Second Vatican Council’s Decree on Ecumenism (Unitatis Redintegratio, no. 8).

Ecclesial Communion and
Concelebration:

These norms must be understood within the context of ecclesial communion. CCEO cc. 699–702 regulate matters concerning those who are authorized to celebrate the Divine Liturgy, the celebration of the Divine Liturgy individually and in concelebration, concelebration among different Churches sui iuris, and the prohibition of concelebration with non-Catholic priests or ministers.

Through these norms, a balance is maintained between the unity of the Church and its proper diversity. When the necessary canonical provisions, permission, and just cause are present, presbyters belonging to different Churches sui iuris can concelebrate.

Conclusion

When carried out in accordance with canonical and liturgical norms, concelebration becomes a profound expression of ecclesial communion. According to CCEO c. 701, this provision is intended to foster love and to manifest the unity of the Churches. At the same time, CCEO c. 702 prohibits the celebration of the Divine Liturgy together with non-Catholic priests or ministers.

These norms help to safeguard both the unity of the Church and the distinctive liturgical tradition of each Church sui iuris. True liturgical communion is possible not by mixing the liturgical traditions, but by concelebrating while preserving the identity of one’s own tradition.

Rev. Dr. Joseph Mattathil