"Now this is the Catholic faith: We worship one God in the Trinity and the Trinity in unity, without either confusing the persons or dividing the substance; for the person of the Father is one, the Son's is another, the Holy Spirit's another; but the Godhead of the Father, Son and Holy Spirit is one, their glory equal, their majesty coeternal" (Athanasian Creed: DS 75; ND 16)." -- Catechism of the Catholic Church, para. 266
("And the Lord appeared to him [Abraham] in the vale of Mambre as he was sitting at the door of his tent, in the very heat of the day. And when he had lifted up his eyes, there appeared to him three men standing near him: and as soon as he saw them he ran to meet them from the door of his tent, and adored down to the ground. And he said: Lord, if I have found favour in thy sight, pass not away from thy servant: But I will fetch a little water, and wash ye your feet, and rest ye under the tree. And I will set a morsel of bread, and strengthen ye your heart, afterwards you shall pass on: for therefore are you come aside to your servant. And they said: Do as thou hast spoken." -- Genesis 18:1-5)
"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." -- Catechism of the Catholic Church, para. 1082
"Christ, indeed, always associates the Church with himself in this great work in which God is perfectly glorified and men are sanctified. The Church is his beloved Bride who calls to her Lord and through him offers worship to the eternal Father." -- Catechism of the Catholic Church, para. 1089
THE FATHER: SOURCE AND GOAL OF THE LITURGY
"1110. In the liturgy of the Church, God the Father is blessed and adored as the source of all the blessings of creation and salvation with which he has blessed us in his Son, in order to give us the Spirit of filial adoption."
CHRIST'S WORK IN THE LITURGY
"1111. Christ's work in the liturgy is sacramental: because his mystery of salvation is made present there by the power of his Holy Spirit; because his Body, which is the Church, is like a sacrament (sign and instrument) in which the Holy Spirit dispenses the mystery of salvation; and because through her liturgical actions the pilgrim Church already participates, as by a foretaste, in the heavenly liturgy."
THE HOLY SPIRIT AND THE CHURCH IN THE LITURGY
"1112. The mission of the Holy Spirit in the liturgy of the Church is to prepare the assembly to encounter Christ; to recall and manifest Christ to the faith of the assembly; to make the saving work of Christ present and active by his transforming power; and to make the gift of communion bear fruit in the Church."
"In the earthly liturgy we share in a foretaste of that heavenly liturgy which is celebrated in the Holy City of Jerusalem toward which we journey..." -- Catechism of the Catholic Church, para. 1090
