[Mrs. Don-o]

"Jesus called the cup *the fruit of the vine*"

He also called Himself "the true Vine."

Moreover, He said it was His blood. You have to conclude that it was, unless He had very poor command of the language, and thought that "This is My Blood, the blood of the Covenant, which is to be poured out for many for the forgiveness of sins" meant "This is NOT My Blood."

And He said the same would be "poured out" for the forgiveness of sins, and that's Blood --- not wine.

[SoothingDave]

Remember, He also apparently said something like “this is my body, true flesh which will profit nothing”.