"A religious person, to whom God gave great love for the Most Blessed Sacrament, amongst other things, wrote as follows in a letter: 'I see that every good thing that I have comes to me from the Most Blessed Sacrament. I have given and consecrated my whole self to Jesus in this Sacrament. I see [...]
"The Church insists that we be in the state of grace in order to receive Our Lord in the Eucharist. As a corpse cannot receive nourishment, so neither may one without the divine life in his soul receive the divine nourishment." Source: Ven. Fulton Sheen, These are the Sacraments
"History bears witness that the virtues of the Christian life have flourished best wherever and whenever the frequent reception of the Eucharist has most prevailed." Source: Pope Leo XIII, MIRAE CARITATIS: ENCYCLICAL OF POPE LEO XIII ON THE HOLY EUCHARIST, May 28, 1902
"This most holy mystery thus needs to be firmly believed, devoutly celebrated and intensely lived in the Church. Jesus' gift of himself in the sacrament which is the memorial of his passion tells us that the success of our lives is found in our participation in the trinitarian life offered to us truly and definitively [...]
"Anyone who desires to receive Christ in Eucharistic communion must be in the state of grace. Anyone aware of having sinned mortally must not receive communion without having received absolution in the sacrament of penance." Source: Catechism of the Catholic Church #1415
"In the Old Testament, the 'memorial' par excellence of God's works in history was the Passover liturgy of the Exodus: every time the people of Israel celebrated the Passover, God effectively offered them the gifts of freedom and salvation… The interweaving of God's remembrance with that of man is also at the centre of the [...]
"O taste and see that the Lord is good. Trust not the judgment to your bodily palate no, but to faith unfaltering; for they who taste are bidden to taste, not bread and wine, but the anti-typical Body and Blood of Christ." Source: St. Cyril of Jerusalem, Catechetical Lectures
"Since the whole mystery of our salvation is comprised in this sacrament, therefore is it performed with greater solemnity than the other sacraments. And since it is written (Eccles. 4:17): 'Keep thy foot when thou goest into the house of God'; and (Ecclus. 18:23): 'Before prayer prepare thy soul,' therefore the celebration of this mystery [...]
"Before leaving the church after Holy Mass, do not forget to thank God for the graces that He has just given to you. St. John and the holy women who were present at the Sacrifice of the Cross never forgot the vision of Calvary, and they came down from the Holy Mount, covered with the [...]
"As sacrifice, the Eucharist is also offered in reparation for the sins of the living and the dead and to obtain spiritual or temporal benefits from God." Source: Catechism of the Catholic Church #1414