CATECHISM OF THE CATHOLIC CHURCH
SECOND EDITION

Paragraphs 2642–2646

2642 The Revelation of "what must soon take place," the Apocalypse, is borne along by the songs of the heavenly liturgy but also by the intercession of the "witnesses" (martyrs). 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. 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. 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 name and, according to the traditions of East and West, it is the "sacrifice of praise."
2644 The Holy Spirit who teaches the Church and recalls to her all that Jesus said also instructs her in the life of prayer, inspiring new expressions of the same basic forms of prayer: blessing, petition, intercession, thanksgiving, and praise.
2645 Because God blesses the human heart, it can in return bless him who is the source of every blessing.
2646 Forgiveness, the quest for the Kingdom, and every true need are objects of the prayer of petition.