[ealgeone]

The parts where the bread and wine are declared to change into the flesh and blood of Christ.

The part where the priest calls Christ down from Heaven and renders Him present on the altar as per O'Brien in The Faith of Millions.

That you have to partake of the Mass to be saved in contrast of Jesus saying we are to believe in Him.

For starters.

[Arthur McGowan]

Jesus said: He who does not eat my flesh and drink my blood can have no life in him. He who eats my flesh and drinks my blood will have eternal life, and I will raise him up on the last day.