We might not realize it, but every Sunday at Mass we’re practicing typology—the Church has given us the lectionary as a key to connecting the Old and New Testaments. Nowhere is this more evident than in the readings for the Feast of the Assumption and their emphasis on the Ark of the Covenant. What might at first be surprising becomes clear when we read the Book of Revelation in light of the Old Testament to discover Mary as the Ark of the New Covenant.