Perhaps the greatest one is what on earth Jesus meant when, at the Last Supper, he said, ‘This is My body,’ and then exhorted his disciples to ‘Do this in remembrance of Me’ (Luke 22:19).
It’s been semi-jokingly said that the Reformation is a bitter, 200-year-long dispute about the exact meaning of each of those four words: this, is, my, and body." PeterMarshall