The real question is “How can we doubt It?”
In today’s Gospel, Jesus could not have made it more clear. TEN times in nine verses (Jn 6: 50-58) he repeatedly explained that he was going to give mankind his own flesh and blood as “real food” and “real drink” so that he can live in us and we in him … so that we may have eternal life.
His statements were so straightforward, so unambiguous that his audience was scandalized. We’re told that the Jews “quarreled among themselves” and that many of the disciples abandoned him after this bread of life discourse. No one suggested that Jesus was just speaking metaphorically.People were perplexed and revolted by the apparent cannibalism his words implied.
At the Last Supper, as Jesus institutes the Sacrament of the Eucharist, his words of consecration echo these earlier statements in the synagogue at Capernaum: "This is my body, which will be given for you" and "This cup is the new covenant in my blood, which will be shed for you” (Lk 22: 19-20). Still, the apostles were clueless … a state of confusion that more or less continued until Pentecost.
But once they got it, they really got it. The greatest miracle, greatest mystery of our faith–the Transubstantiation of bread and wine into the body, blood, soul and divinity of Jesus Christ with the words of consecration at every Mass–became the core of Christian worship and "the source and summit of Christian life."
The Fathers of the Church gave witness to the fact that Jesus did not give us a symbol of himself, but instead empowered his Church, through her priests, to continue his physical presence in the world. In fact, a famous Protestant scholar, J.N.D. Kelly, who extensively studied the history of the early church, affirmed this understanding of the Eucharist. He wrote:
Eucharistic teaching, it should be understood at the outset, was in general unquestioningly realist, i.e., the consecrated bread and wine were taken to be, and were treated and designated as, the Savior’s body and blood (Early Christian Doctrines, 440).
In 110 A.D., St. Ignatius of Antioch wrote:
Take note of those who hold heterodox opinions on the grace of Jesus Christ which has come to us, and see how contrary their opinions are to the mind of God. They abstain from the Eucharist and from prayer because they do not confess that the Eucharist is the flesh of our Savior Jesus Christ, flesh which suffered for our sins and which that Father, in his goodness, raised up again. They who deny the gift of God are perishing in their disputes (Letter to the Smyrnaeans 6:2–7:1).
Around the year 151 A.D., St. Justin wrote these words to the Roman Emperor Antoninus Pius:
We call this food Eucharist, and no one else is permitted to partake of it, except one who believes our teaching to be true and who has been washed in the washing which is for the remission of sins and for regeneration [i.e., has received baptism] and is thereby living as Christ enjoined. For not as common bread nor common drink do we receive these; but since Jesus Christ our Savior was made incarnate by the word of God and had both flesh and blood for our salvation, so too, as we have been taught, the food which has been made into the Eucharist by the Eucharistic prayer set down by Him, and by the change of which our blood and flesh is nurtured, is both the flesh and the blood of that incarnated Jesus (First Apology 66).
A famous (former) Protestant minister once attended Mass out of curiosity. Dr. Scott Hahn wrote movingly about his first experience of the Transubstantiation. He explained:
As an evangelical Calvinist, I had been taught that the Catholic Mass was the greatest sacrilege that a man could commit – to re-sacrifice Christ – so I wasn’t sure what to do.
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