As Catholics one of the truths that we hold that has been handed down from Jesus and the apostles is that Jesus is really (not just symbolically) present in the Eucharist, also called Holy Communion.
Below are some passsages from the New Testament regarding the Eucharist, which we Catholics believe are literally true because this is the understanding that has been handed down to us through the centuries from the apostles as part of the deposit of the faith. Even though they may seem incredible or miraculous, they are not unreasonable, because we also believe that Jesus is God who not only knows all things but is all powerful and can do all things. We believe this because Jesus taught it and our faith is in Jesus. Jesus loves us so much that He wants to be as united to us as possible and this is one way He decided that we could be united to Him not only in spirit but also receive Him literally into bodies.
Scripture Verses on the Eucharist:
Jesus said in John 6:48-65: " 'I am the bread of life. Your ancestors ate the manna in the desert, but they died; this is the bread that comes down from heaven so that one may eat it and not die. I am the living bread that came down from heaven; whoever eats this bread will live forever; and the bread that I will give is my flesh for the life of the world.' The Jews quarreled among themselves, saying, 'How can this man give us (his) flesh to eat?' Jesus said to them, '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. Whoever eats my flesh and drinks my blood has eternal life, and I will raise him on the last day.
For my flesh is true food, and my blood is true drink. Whoever eats my flesh and drinks my blood remains in me and I in him. Just as the living Father sent me and I have life because of the Father, so also the one who feeds on me will have life because of me. This is the bread that came down from heaven. Unlike your ancestors who ate and still died, whoever eats this bread will live forever.' These things he said while teaching in the synagogue in Capernaum. Then many of his disciples who were listening said, 'This saying is hard; who can accept it?'
Since Jesus knew that his disciples were murmuring about this, he said to them,
'Does this shock you? What if you were to see the Son of Man ascending to where he was before? It is the spirit that gives life, while the flesh is of no avail. The words I have spoken to you are spirit and life. But there are some of you who do not believe.'Jesus knew from the beginning the ones who would not believe and the one who would betray him. And he said, 'For this reason I have told you that no one can come to me unless it is granted him by my Father.' "
Matt. 26:26-28: "Now as they were eating, Jesus took bread, and blessed, and broke it, and gave it to the disciples and said, 'Take, eat; this is my body.' And he took a cup, and when he had given thanks he gave it to them, saying, 'Drink of it, all of you; for this is my blood of the covenant, which is poured out for many for the forgiveness of sins.' "
Mark 14:22-24: " 'And as they were eating, he took bread, and blessed, and broke it, and gave it to them, and said, Take; this is my body. And he took a cup, and when he had given thanks he gave it to them, and they all drank of it. And he said to them, This is my blood of the covenant, which is poured out for many.' "
Luke 22:19-20: "And he took bread, and when he had given thanks he broke it and gave it to them, saying, 'This is my body which is given for you. Do this in remembrance of me.' And likewise the cup after supper, saying, 'This cup which is poured out for you is the new covenant in my blood.' "
1 Cor. 10:16-17: "The cup of blessing which we bless, is it not a participation in the blood of Christ? The bread which we break, is it not a participation in the body of Christ? Because there is one bread, we who are many are one body, for we all partake of the one bread."
1 Cor. 11:23-29: "For I received from the Lord what I also delivered to you, that the Lord Jesus on the night when he was betrayed took bread, and when he had given thanks, he broke it, and said, 'This is my body which is for you. Do this in remembrance of me.' In the same way also the cup, after supper, saying, 'This cup is the new covenant in my blood. Do this, as often as you drink it, in remembrance of me.'
For as often as you eat this bread and drink the cup, you proclaim the Lord's death until he comes. Whoever, therefore, eats the bread or drinks the cup of the Lord in an unworthy manner will be guilty of profaning the body and blood of the Lord. Let a man examine himself, and so eat of the bread and drink of the cup. For any one who eats and drinks without discerning the body eats and drinks judgment upon himself."