Except he did it in Greek or Hebrew.
and on the Sabbath. That sort of spoils the whole Latin Mass thing altogether.
Pay no mind to the troll. He doesn't know; he wasn't there. In those times, people also spoke Latin and Aramaic.
You are correct that both liturgy and Scripture were known in the West in Greek before they were translated into Latin, although we don't know anymore just how much of the Roman Rite is a translation of a Greek original, and how much was composed de novo in Latin.