Jesus reveals to the Jews not only the truth and reality of the Eucharist but also its purpose. Truth, reality, the purpose must never be separated. They must remain one if the gift of Christ Jesus is to produce true fruits of eternal life. The Eucharist cannot be received except for the fulfillment of the purpose set in it by the Lord. But the end can never be reached if the Eucharist is not true body, true blood, true flesh of Jesus.
A symbol is not reality. The primary purpose of the Eucharist is to transform those who receive it into eternal life: "If you do not eat the flesh of the Son of Man and drink his blood, you do not have life in you". God is eternal life. Eternal life is in the flesh of Christ, in his body, in his blood. By eating Christ's body and drinking his blood, we gradually become eternal life, we are a charity as God is charity, truth as God is truth in our nature.
A second purpose is a glorious resurrection, in the image of the glorious resurrection of Christ the Lord: "Whoever eats my flesh and drinks my blood has eternal life and I will raise him up on the last day". The Eucharist is divine life, which is eternal life, and must prepare our body to be clothed in eternal glory. From nature according to the flesh, it begins to become nature according to the Spirit. From the works of the flesh, he passes to produce fruits according to the Spirit. From thought according to the world, we see the signs in the body of thought according to God. When the Eucharist is eaten with faith, everything in us changes and is transformed. This happens, it can only happen if the Eucharist is given in its truth and reality of true body and blood: "My flesh is true food and my blood true drink". If the reality and truth of the body and blood are missing, nothing happens. Our body is dry wood. If the fire is approached the wood, it burns, heats, illuminates. If the fire does not come close, it remains only wood. If the Eucharist is not the true fire of God, true eternal life, true resurrection, because it is not true flesh and true blood, the wood remains only dry wood, it will never burn.
A third fruit of the Eucharist is the creation of an indissoluble union, unity, communion of life between Christ Jesus and whoever eats his body and his blood: "Whoever eats my flesh and drinks my blood remains in me and I In him". Through his flesh and his blood, he becomes us and we become him. The condition is always one: to approach the Eucharist in respect of its truth and purpose. We have only one thought that guides us, that of the Father, and one only Spirit that leads us, the Holy Spirit of Christ Jesus. A fourth purpose is a supernatural capacity we receive to live always and only for Christ: "As the Father, who lived, sent me and I live for the Father, so also he who eats me will live for me". By eating the Eucharist according to truth, we can live for Christ, obeying Christ. Everything is enclosed in the Eucharist. It is the life of every other sacrament.
Mother of God, Angels, Saints, help us to live the Eucharist in full respect for it.