One Bread, One Body
"'The liturgy is the summit toward which the activity of the Church is directed; it is also the font from which all of her power flows.' It is, therefore, the privileged place for catechizing the People of God. 'Catechesis is instrinsically linked with the whole of liturgical and sacramental activity, for it is in the sacraments, esepcially in the Eucharist, that Christ Jesus works in fullness for the transformation of men.'
Liturgical catechesis aims to initate people into the mystery of Christ (It is "mystagogy.") by proceeding from the visible to the invisible, from the sign to the thing signified, from the 'sacraments' to the 'mysteries.'"
Catechism of the Catholic Church, 1074-1075
"In the Church's liturgy the divine blessing is fully revealed and communicated. The Father is acknowledged and adored as the source and the end of all the blessings of creation and salvation. In his Word who became incarnate, died, and rose for us, he fills us with his blessings. Through his Word, he pours into our hearts the Gift that contains all gifts, the Holy Spirit.
The dual dimension of the Christian liturgy as a response of faith and love to the spiritual blessings the Father bestows on us is thus evident. On the ne hand, the Church, united with her Lord and 'in the Holy Spirit,' blesses the Father 'for his inexpressinble gift' in her adoration, praise, and thanksgiving. On the other hand, until the consummation of God's plan, the Church never ceases to present to the Father the offering of his own gifts and to beg him to send the Holy Spirit upon that offering, upon herself, upon the faithful, and upon the whole world, so that through communion in the death and resurrection of Christ the Priest, and by the power of the Spirit, these divine blessings will bring forth the fruits of life "to the praise of his glorious grace."
Catechism of the Catholic Church, 1082-1083