The Eucharist is the “source and summit of the Christian Life” (Lumen Gentium, 11). It is the sacrament in which Christ is really and truly present under the appearances of bread and wine. The Sacrament of the Eucharist was described as follows by the Second Vatican Council:
At the Last Supper, on the night when he was betrayed, our Savior instituted the Eucharistic Sacrifice of his Body and Blood. He did this in order to perpetuate the Sacrifice of the Cross throughout the centuries 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 (Catechism of the Catholic Church 1322-1419).