In this episode we discuss the mystery of transubstantiation whereby the entire substance of the bread and wine becomes the entire substance of Christ’s body and blood. Transubstantiation does not indicate any sort of local movement nor is it like any natural change (or “transformation”) in our experience, therefore a new term was necessary to indicate this supernatural change. In addition to reading the catechism we also spend some time reading some excerpts from three articles in question 75 of the third part of the Summa Theologica. (ST. IIIa Q. 75 a. 2, a. 4, and a. 7)