Catechism of the Catholic Church §513 — excerpt
According to circumstances catechesis will make use of all the richness of the mysteries of Jesus. Here it is enough merely to indicate some elements common to all the mysteries of Christ's life (I), in order then to sketch the principal mysteries of Jesus' hidden (II) and public (III) life.
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.