The Mass and Transubstantiation
The Roman Catholic Church teaches that at the consecration the bread and wine become the body and blood of Christ, to be adored, and that the Mass makes present and offers the one sacrifice of Calvary for the living and the dead; Scripture teaches that Christ offered Himself once for all and gave His churches a supper of remembrance.
The lesson walks through the topic one card at a time. The full study is the complete written article, with its sources.
Explain transubstantiation as the Fourth Lateran Council (1215) and the Council of Trent (1551) defined it
Describe the Catholic teaching that the Mass is a true and propitiatory sacrifice (Trent, Session 22; Catechism, §§1365–1367)
Explain the adoration of the consecrated host and why Rome practices it
Answer from Hebrews 10:10-14, Luke 22:19, and John 6:63, and show why the Lord's Supper is a memorial