In the 3rd century, there were a group of Christians who began to try and celebrate the Eucharist with water instead of wine, and they were known as the Hydroparastatae or Aquarians. During the Decian persecution, they would substitute water for wine. St. Cyprian’s refutation of this erroneous practice comes to us in a letter to a certain Caecilius and it affords us the opportunity to see a 3rd century Saint expose the realism of the sacrifice of the holy Mass. I strongly encourage the readers to visit the full letter at the link after the citation to read the whole thing. Its priceless. Notice, most particularly, two things: how Cyprian describes the priest who offers the Eucharist to be doing what Christ himself did during the Last Supper, and how drastically important it is to get the Eucharistic tradition right in all its particulars.