248. What is the criterion that assures unity in the midst of plurality?

248. What is the criterion that assures unity in the midst of plurality?   

(Comp 248) It is fidelity to the Apostolic Tradition, that is, the communion in the faith and in the sacraments received from the apostles, a communion that is both signified and guaranteed by apostolic succession. The Church is Catholic and therefore can integrate into her unity all the authentic riches of cultures.

“In brief”

(CCC 1209) The criterion that assures unity amid the diversity of liturgical traditions is fidelity to apostolic Tradition, i e., the communion in the faith and the sacraments received from the apostles, a communion that is both signified and guaranteed by apostolic succession. 

To deepen and explain

(CCC 1200) From the first community of Jerusalem until the parousia, it is the same Paschal mystery that the Churches of God, faithful to the apostolic faith, celebrate in every place. The mystery celebrated in the liturgy is one, but the forms of its celebration are diverse. (CCC 1203) The liturgical traditions or rites presently in use in the Church are the Latin (principally the Roman rite, but also the rites of certain local churches, such as the Ambrosian rite, or those of certain religious orders) and the Byzantine, Alexandrian or Coptic, Syriac, Armenian, Maronite and Chaldean rites. In "faithful obedience to tradition, the sacred Council declares that Holy Mother Church holds all lawfully recognized rites to be of equal right and dignity, and that she wishes to preserve them in the future and to foster them in every way" (SC 4). 

On reflection

(CCC 1204) The celebration of the liturgy, therefore, should correspond to the genius and culture of the different peoples (Cf. SC 37-40). In order that the mystery of Christ be "made known to all the nations… to bring about the obedience of faith" (Rom 16:26), it must be proclaimed, celebrated, and lived in all cultures in such a way that they themselves are not abolished by it, but redeemed and fulfilled  (Cf. CT 53): It is with and through their own human culture, assumed and transfigured by Christ, that the multitude of God's children has access to the Father, in order to glorify him in the one Spirit. 

 
(Next question: Is everything immutable in the liturgy?)