Transubstantiation came to be a formulation that the Roman Catholic Church affirmed at the Council of Trent in the 16th century. Thomas Aquinas's unique contribution was applying Aristotelian philosophical thinking to it. So there's no wine, there's no bread after the consecration. It only looks like bread. But its essence actually is the body and blood of Christ.
Christ instituted the Lord’s Supper and commanded the church to “do this in remembrance of me.” But why? In this episode of White Horse Inn, hosts Michael Horton, Justin Holcomb, Bob Hiller, and Walter Strickland compare the unique views of the Lutheran, Baptist, Reformed, and Anglican traditions of this sacrament and what it means to participate in our union with Christ by “eating his body and drinking his blood.”