Wisdom from Dr. Brant Pitre

The reason that the Jewish Christians of the first century understood the real presence of the Eucharist is because they knew the Old Testament and the prophecies of the Old Testament which were fulfilled in Christ and in the Eucharist. I would also suggest more negatively that one of the reasons many Catholics today and many Christians today do not believe in the real presence of Christ in the Eucharist is because they are not familiar with the prophecies of the Old Testament, and they can't see the fulfillment that Christ brings in the Eucharist.

—Dr. Brant Pitre from Jesus and the Jewish Roots of the Eucharist