"For what concerns diversity of rites in the sacred liturgy, the Apostolic See has always made its position clear: not only it does not condemn diversity, but it eagerly and willingly grants to each nation the right to keep and preserve the legitimate customs and traditions of its forbears."

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We are here speaking in open disapproval of that false system of philosophy, not so long ago introduced, by which, because of an extended and unbridled desire of novelty, truth is not sought where it truly resides, and, with a disregard for the holy and apostolic traditions, other vain, futile, uncertain doctrines, not approved by the Church are accepted as true, on which very vain men mistakenly think that truth itself is supported and sustained.

— Pope Gregory XVI