There is a very common -- and extremely relevant -- theme in the readings today. Both Joshua and Jesus ask their contemporaries to make a decision. "Who will you serve?" "Will you leave me, too?" Even (and especially) amidst trials and difficulties of all kinds, we pray for the grace to answer as our ancestors did: "As for me and my house, we will serve the Lord!" And from St. Peter: "Lord, to whom will we go? You have the words of everlasting life."
We are making our way through the sixth chapter of the Gospel of John, sometimes referred to as the "Bread of Life Discourse." Today Jesus hears the people around him "murmuring" about him and his teaching. This recalls the attitude that our ancestors had toward Moses and the teachings that he revealed to them from God. 'Murmuring' in the Bible goes beyond incredulity -- the people weren't simply in awe of what he was saying; it shows that they doubted and disagreed with what was being taught. Jesus's answer to them is that it is God the Father who draws them and teaches them the Truth, if only the people will allow it.
The Eucharist is the Living Bread come down from heaven. It is Jesus' flesh, for the life of the world.
Today's Gospel comes from John 6, the chapter which give us Christ's teaching on the Bread of Life. Following the story of the multiplication of the loaves and fish, Jesus expounds on the True Bread that comes down from heaven -- the Eucharist -- and explains how we should hunger and thirst for it about all things. We believe without a doubt that the Eucharist truly is the Real Presence; the Body, Blood, Soul, and Divinity of Jesus Christ. Through the Eucharist we have communion with the Father, and thus we can come to enjoy eternal life.