How do you explain John 6:53 to a non-Catholic Christian who is a strong believer?
“Amen, amen, I say to you, unless you eat the flesh of the Son of Man and drink his blood, you do not have life within you.”
Someone who is passionate about her faith, yet does not believe in the Real Presence, how can explain “you do not have life within you”?
usccb.org/prayer-and-worship/resources-for-the-eucharist/the-real-presence-of-jesus-christ-in-the-sacrament-of-the-eucharist-basic-questions-and-answers.cfm
This link goes into the whole subject in depth. At the end, in the summary this quote and some context is given.
Let’s remember that when Jesus said that, no one in His whole audience could do it YET.
Some grumbled the teaching was hard and left him. The apostles stayed, and at the Last Supper Jesus instituted the Eucharist to show HOW it would be done, WHAT it was, WHO should “do this in memory of me …” (the THIS being a re-enactment of His offering bread and wine, pronouncing “This is my body … This is my blood … take and eat…take and drink …” and performing His “once for all sacrifice” of the " …new covenant in my blood" in the manner of their new “High Priest,” Savior, King and Lord (God), Jesus.
The Church obediently performs the sacraments instituted by Christ and furthers His teachings as it participates in His work of salvation.
Today WE Catholics can do this … but in charity ask … what about the others? In the Catechism of the Catholic Church we learn of something similar to this in this section:
VI. THE NECESSITY OF BAPTISM
1257 The Lord himself affirms that Baptism is necessary for salvation.60 He also commands his disciples to proclaim the Gospel to all nations and to baptize them.61 Baptism is necessary for salvation for those to whom the Gospel has been proclaimed and who have had the possibility of asking for this sacrament.62 The Church does not know of any means other than Baptism that assures entry into eternal beatitude; this is why she takes care not to neglect the mission she has received from the Lord to see that all who can be baptized are “reborn of water and the Spirit.”
God has bound salvation to the sacrament of Baptism, but he himself is not bound by his sacraments.
We are assured that God wants none to perish but for all to come to repentance.
We are taught that outside the Church there is no salvation (rather like Noah’s Ark in Noah’s day). So AS the Church we should be inviting others to come, welcoming them, etc.
And while Jesus is the High Priest and Head of the Church and can save whom He wilt,
it is not the Church’s job to go slack and cease to “teach the Nations” or forgive sins or
distribute the Body of Christ in the Eucharist to believers.