|Catechism of the Catholic Church|
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V. Prayer of Praise
2639 Praise is the form of prayer which recognizes most immediately that God is God. It lauds God for his own sake and gives him glory, quite beyond what he does, but simply because HE IS. It shares in the blessed happiness of the pure of heart who love God in faith before seeing him in glory. By praise, the Spirit is joined to our spirits to bear witness that we are children of God,121 testifying to the only Son in whom we are adopted and by whom we glorify the Father. Praise embraces the other forms of prayer and carries them toward him who is its source and goal: the "one God, the Father, from whom are all things and for whom we exist."122
2640 St. Luke in his gospel often expresses wonder and praise at the marvels of Christ and in his Acts of the Apostles stresses them as actions of the Holy Spirit: the community of Jerusalem, the invalid healed by Peter and John, the crowd that gives glory to God for that, and the pagans of Pisidia who "were glad and glorified the word of God."123
2641 "[Address] one another in psalms and hymns and spiritual songs, singing and making melody to the Lord with all your heart."124 Like the inspired writers of the New Testament, the first Christian communities read the Book of Psalms in a new way, singing in it the mystery of Christ. In the newness of the Spirit, they also composed hymns and canticles in the light of the unheard - of event that God accomplished in his Son: his Incarnation, his death which conquered death, his Resurrection, and Ascension to the right hand of the Father.125 Doxology, the praise of God, arises from this "marvelous work" of the whole economy of salvation.126
2642 The Revelation of "what must soon take place," the Apocalypse, is borne along by the songs of the heavenly liturgy127 but also by the intercession of the "witnesses" (martyrs).128 The prophets and the saints, all those who were slain on earth for their witness to Jesus, the vast throng of those who, having come through the great tribulation, have gone before us into the Kingdom, all sing the praise and glory of him who sits on the throne, and of the Lamb.129 In communion with them, the Church on earth also sings these songs with faith in the midst of trial. By means of petition and intercession, faith hopes against all hope and gives thanks to the "Father of lights," from whom "every perfect gift" comes down.130 Thus faith is pure praise.
2643 The Eucharist contains and expresses all forms of prayer: it is "the pure offering" of the whole Body of Christ to the glory of God's name131 and, according to the traditions of East and West, it is the "sacrifice of praise."