One of the things I like most about Vikings is the way they show us parallel events between Ragnar's Viking society and the Christian one of Athelstan's and how different or similar those events are managed. Some of them are evident and quite straight forward, like how a woman accused of being unfaithful is treated. Some of them are more subtle but no less interesting, like the page Athelstan is writing at king Ecbert's court in S2E6. It is a passage from the Bible, Matthew 1:18-24, describing the birth of Christ and Joseph's reaction on learning that Mary was with child. What the angel tells Joseph is more or less what Lagertha tells the Viking man about the god Heimdal in S1E7 but instead of a holy ghost, Heimdal appears in the flesh.