" As I described in chapter 1, it was only when I began attending Mass that the many parts of this puzzling book suddenly began to fall into place. Before long, I could see the sense in Revelation's altar (Rev 8:3), its robed clergymen (4:4), candles (1:12), incense (5:8), manna (2:17), chalices (ch. 16), Sunday worship (1:10), the prominence it gives to the Blessed Virgin Mary (12:1–6), the “Holy, Holy, Holy” (4:8), the Gloria (15:3–4), the Sign of the Cross (14:1), the Alleluia (19:1, 3, 6), the readings from Scripture (ch. 2–3), and the “Lamb of God” (many, many times). These are not interruptions in the narrative or incidental details; they are the very stuff of the Apocalypse. "

― Scott Hahn , The Lamb's Supper: The Mass as Heaven on Earth