Why Do Catholics Do That?
Aug 8, 2017
What is Transubstantiation?
During Mass, although the appearance doesn't change, the substance of the bread offered by the priest is changed into the substance of the Body of Christ. The same is true of the wine - its substance is changed into Christ's Blood.
Catholics believe that the words Christ said at the Last Supper, "This is my Body, this is my Blood," meant that really and physically the bread and wine became his Body and Blood. He decreed that it be so.