If a Latin Cleric joins an Eastern Liturgy, what does he do?
and Vice-versa
Actually my real question is what do Latin Bishops do when they “concelebrate” (if that’s the right term) with their Eastern Brothers and how do Eastern Bishops “concelebrate” with their Latin Brothers in a Mass.
Sorry for any misconceptions. I live in the Philippines, dominantly, if not purely, Latin Rite.
There are three possibilities.
In the case of the cleric being bi-ritual, he is fully functional in each and would function in the other as freely as he does in his own.
In the case of a cleric who cannot function liturgically at all in the other rite, he should sit in choir and participate in the liturgy in that fashion.
Redemptionis Sacramentum, No. 113: “Where it happens that some of the Priests who are present do not know the language of the celebration and therefore are not capable of pronouncing the parts of the Eucharistic Prayer proper to them, they should not concelebrate, but instead should attend the celebration in choral dress in accordance with the norms.”
On a limited number of occasions, I have concelebrated when I have sufficient command of the liturgical language to do at least what is minimally essential. I properly wear the vestments of the Latin rite since I am Latin rite.
It can happen, in case of true necessity and in the unforeseen and unplanned absence of vestments proper to one’s own Church that one could wear what corresponds to one’s station in the other but that is not desirable and really should be avoided, if at all possible. This is, for example, finding myself where I am in an Eastern Catholic Church unplanned or with lost luggage and therefore without my own vestments and being provided by my host with what they have at hand in order for me to be able to concelebrate.
Canon 701 for the Code of the Eastern Churches says:
For a just cause and with the permission of the eparchial bishop, bishops and presbyters of different churches ‘sui iuris’ can concelebrate, especially to foster love and to manifest the unity of the Churches. All follow the prescripts of the liturgical books of the principal celebrant, avoiding any liturgical syncretism whatever, and preferably with all wearing the liturgical vestments and insignia of their own Church ‘sui iuris.’