Along with physical hunger man has within him another hunger, a more basic hunger, which cannot be satisfied by ordinary food. It is a hunger for life, a hunger for eternity. The sign of the manna was the proclamation of the coming of Christ who was to satisfy man's hunger for eternity by himself becoming the "living bread" which "gives life to the world". And see: those who heard Jesus ask him to fulfil what had been proclaimed by the sign of the manna, perhaps without being conscious of how far their request would go: "Lord, give us this bread always" (Jn 6:34). How eloquent is this request! How generous and how amazing is its fulfilment. "I am the bread of life; he who comes to me shall not hunger, and he who believes in me shall never thirst... For my flesh is food indeed, and my blood is drink indeed. He who eats my flesh and drinks my blood abides in me, and I in him" (Jn 6:35,55-56). "He who eats my flesh and drinks my blood has eternal life, and I will raise him up at the last day' (Jn 6:54).
What a great dignity has been bestowed on us! The Son of God gives himself to us in the Most Holy Sacrament of his Body and Blood. How infinitely great is God's generosity! He responds to our deepest desires, which are not only desires for earthly bread, but extend to the horizons of life eternal. This is the great mystery of faith!
[Pope John Paul II, homily in Wroclaw 31 May 1997]