Sacrament of the Eucharist
The Holy Eucharist is the most important of the seven sacraments because, in this and in no other sacrament, we receive the very body and blood, soul and divinity of Jesus Christ. Innumerable, precious graces come to us through the reception of Holy Communion.
Thus the mystery of the Eucharist summarizes the whole mystery of our redemption. There are two fundamental relationships in which Christ stands to us. First, he is our priestly mediator with God and offers him atonement for our sins. But Christ is not a stranger to us, who merely represents us as a propitiator before God. He comes to us in the second relationship by being the mediator of the grace which God gives us on account of his sacrifice. That is the mystery of our union with Christ who is the source of all grace for us. 'And of his fullness we have all received, grace for grace' (John 1:16).