A useful book to understand the original purpose and practice in the ancient Church of what are now called the 'sacraments.' We are also encouraged by this work too conform our gatherings back to the mode and heart of our original Christian brethren. This is a well footnoted work that has engaging concepts your mind can grasp through metaphor and analogy to understand what Eller is trying to teach.
"There is not the slightest doubt that the early Christians celebrate in the Lords supper sitting, or reclining, around tables. And I hope to make it obvious that the service itself calls for looking your brother in the eye, and smiling, breaking bread with him, and perhaps even exchanging the holy kiss. Pews have given a bad odor to the Christian ordinances.
Originally the Eucharist was celebrated as part of a real supper, a real full meal, the love feast or agape. In time because of some practical difficulties that arose, the meal was dropped and the Eucharist was celebrated alone. No scholar will dispute this. However most of them do manage to leave the impression that the two events always had been somewhat distinct and separate; that the meal never had been “sacramental“ in the sense that the Eucharist was; and that, without the meal, the Eucharist simply continued as always."