"The holy Eucharist completes Christian initiation. Those who have been raised to the dignity of the royal priesthood by Baptism and configured more deeply to Christ by Confirmation participate with the whole community in the Lord's own sacrifice by means of the Eucharist. (CCC 1322)
The Eucharist is "the source and summit of the Christian life." The other sacraments, and indeed all ecclesiastical ministries and works of the apostolate, are bound up with the Eucharist and are oriented toward it. The Eucharist is the sign of unity of the people with God. The Eucharistic hymns or those sung during Holy Communion or to the Holy Sacrament, express these theological truths, or are the thanksgiving of the Church for the gift of Christ remaining with us in the form of bread and wine.