CATECHISM OF THE CATHOLIC CHURCH
SECOND EDITION

Paragraphs 1206–1209

1206 "Liturgical diversity can be a source of enrichment, but it can also provoke tensions, mutual misunderstandings, and even schisms. In this matter it is clear that diversity must not damage unity. It must express only fidelity to the common faith, to the sacramental signs that the Church has received from Christ, and to hierarchical communion. Cultural adaptation also requires a conversion of heart and even, where necessary, a breaking with ancestral customs incompatible with the Catholic faith."
1207 It is fitting that liturgical celebration tends to express itself in the culture of the people where the Church finds herself, though without being submissive to it. Moreover, the liturgy itself generates cultures and shapes them.
1208 The diverse liturgical traditions or rites, legitimately recognized, manifest the catholicity of the Church, because they signify and communicate the same mystery of Christ.
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.