The Eucharist for Us
The Eucharist is "the source and summit of the Christian life." The other sacraments, all ministries, and all our good works, are governed by the Eucharist because it is the central spiritual mystery the Church. The Eucharist is Christ himself, who sacrificed himself for our eternal life.
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.
At the Last Supper, on the night he was betrayed, our Savior instituted the Eucharistic sacrifice of his Body and Blood. This he did in order to perpetuate the sacrifice of the cross throughout the ages until he should come again, and so to entrust to his beloved Spouse, the Church, a memorial of his death and resurrection: a sacrament of love, a sign of unity, a bond of charity, a Paschal banquet 'in which Christ is consumed, the mind is filled with grace, and a pledge of future glory is given to us.
The Catechism of the Catholic Church
Receiving the Eucharist enables us to share in the divine life of Christ, unifies the People of God into the Body of Christ, and it is the most perfect way to worship God.