Above is an explanation of a service I have seen countless times during Orthros (Mattins & Lauds), but never heard aloud aside from a few words. A priest of some Orthodox community explains the Proskomide, the preparation rites for the bread and wine prior to the Divine Liturgy. The prayers are heuristic and indicative of a liturgical theology that takes the reality of the opus Dei during the Eucharist seriously.
As an aside, the priest is likely wrong when he says that the Liturgy of St. John Chrysostom originates in St. John Chrysostom. I am told that St. Basil is the most likely to have had extensive influence on the Byzantine rite named for him. The Liturgy of St. John Chrysostom, like the "Ambrosian rite" of Milan, is probably named for the most prominent bishop of the diocese that used it.
