45 Additional proof of this indefeasible right of the ecclesiastical hierarchy lies in the circumstances that the sacred liturgy is intimately bound up with doctrinal propositions which the Church proposes to be perfectly true and certain, and must as a consequence conform to the decrees respecting Catholic faith issued by the supreme teaching authority of the Church with a view to safeguarding the integrity of the religion revealed by God.
Source: Mediator Dei (Vatican.va)