Catechism of the Catholic Church §1674 — excerpt
Besides sacramental liturgy and sacramentals, catechesis must take into account the forms of piety and popular devotions among the faithful. the religious sense of the Christian people has always found expression in various forms of piety surrounding the Church's sacramental life, such as the veneration…
This translation is under copyright, so only the cited words are quoted here. Follow the link for the full text. Translation: English translation of the Catechism of the Catholic Church, 2nd ed. (Libreria Editrice Vaticana), as posted at vatican.va.
Also cites: Council of Nicaea II: DS 601 · 603 · Council of Trent: DS 1822