Pope Francis advises us that a place at the Table of the Lord is by invitation. Nobody earns the grace of Christ.
4. No one had earned a place at that Supper. All had been invited. Or better said: all had been drawn there by the burning desire that Jesus had to eat that Passover with them. He knows that he is the Lamb of that Passover meal; he knows that he is the Passover. This is the absolute newness, the absolute originality, of that Supper, the only truly new thing in history, which renders that Supper unique and for this reason “the Last Supper,” unrepeatable.
This continues the vector from the creation of the universe, that God desires to draw all of his created persons into a union. Since he fashioned us as being that require the sustenance of food as well as companionship, this is the form of the divine gesture toward union. The Gospel parables suggest the deepest fulfillment of God’s desire will only occur when all people are joined as one together, and with God.
Nonetheless, his infinite desire to re-establish that communion with us that was and remains his original design, will not be satisfied until every man and woman, from every tribe, tongue, people and nation (Revelation 5:9), shall have eaten his Body and drunk his Blood. And for this reason that same Supper will be made present in the celebration of the Eucharist until he returns again.
The full document, copyright © Dicastero per la Comunicazione – Libreria Editrice Vaticana is here on the Vatican site.