I'm spending some effort examining what was believed about the Eucharist across the centuries. I'm surprised that the earliest references (Tertullian, Irenaeus, etc.) do seem to strongly favor the Eucharist being the literal body and blood of the Lord, rather than just symbolic. Does anyone have any information about the earliest writings that clearly say the Eucharist is symbolic? Did the "it's only symbolic" view start in Luther's time?