CCC 1176
© Libreria Editrice Vaticana Source: vatican.va
The celebration of the Liturgy of the Hours demands not only harmonizing the voice with the praying heart, but also a deeper "understanding of the liturgy and of the Bible, especially of the Psalms." SC 90.
Read the full chapter 2. The Sacramental Celebration of the Paschal Mystery ¶1135–1209