The holy Eucharist completes Christian initiation. "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 com 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.'" - CCC 1323
Effects of the Eucharist
Reception of the Eucharist for the 1st time completes Christian initiation.
Reception heals venial sin, and preserves us from future sin.
Preserves, increases, and renews the life of grace recieved at baptism.
Renews, strengthens, and deepens bonds of unity with the mystical body.
It is the pledge of everlasting life.