Roman Catechism 18.186

Chapter 18 — Part II: The Sacraments — The Holy Eucharist

Section 186. The Rites and ceremonies of the Mass — The Sacrifice (of the Mass) is celebrated with many solemn rites and ceremonies, none of which should be deemed useless or superfluous. On the contrary, all of them tend to display the majesty of this august Sacrifice, and to excite the faithful when beholding these saving mysteries, to contemplate the divine things which lie concealed in the Eucharistic Sacrifice. On these rites and ceremonies we shall not dwell, since they require a more lengthy exposition than is compatible with the nature of the present work; moreover priests can easily consult on the subject some of the many booklets and works that have been written by pious and learned men.