“why would we have to eat Jesus’ flesh in order to have eternal life?” Because
we are
flesh and spirit. And at the last supper when Jesus gave His disciples His flesh (bread) and His blood (wine) it was because we are physical beings with a body and to take in nourishment we have to
eat and drink. Therefore we take Jesus (body, blood, soul and divinity) into ourselves in the only physical way we can. Jesus and the communicant then are united physically and spiritually.
When he quotes St Paul in
Romans 12:1 "
* I urge you therefore, brothers, by the mercies of God, to offer your bodies as a living sacrifice, holy and pleasing to God, your spiritual worship.
a" - down the bottom of this page in the * notes it explains “The Mosaic code included elaborate directions on sacrifices and other cultic observances. The gospel, however, invites believers to present their bodies as a living sacrifice”.
We do this when we unite ourselves to Jesus when He is offered to the Father in the Holy Sacrifice of The Mass - when the priest raises up the Blessed Sacrament and the Chalice during Mass (he is offering these to God as well as the time when we join ourselves to Christ in this offering).
We also do this when we make our morning offering to God. “Oh Sacred Heart of Jesus, through the Immaculate Heart of Mary, I offer you all my prayers, works, sufferings and joys of this day for all the intentions of your Sacred Heart, in thanksgiving for your favors, in reparation for my sins” or some variation.
St Paul was counselling as to how we should live our lives because in
Romans 12:2 he goes on to say “Do not conform yourselves to this age but be transformed by the renewal of your mind, that you may discern what is the will of God, what is good and pleasing and perfect.” Thus when we turn away from sin (choosing the will of God and what is good and pleasing and perfect), we sacrifice our own wills. E.g. instead of looking at porn, we turn our eyes away - thus denying ourselves this sinful pleasure is a sacrifice.
Under the old Mosaic law (Christ terminated the old law) animals were killed and sacrificed to God, as well as other foods - therefore dead sacrifices. But
Jesus is Risen and so is
a living sacrifice as are we ourselves when we offer our lives to God.
continued below