The quote humorously contrasts the Christian calendar system, Anno Domini, with the Norse god Thor's feelings about it. While many Christians celebrate their religious history and timeline marked by the birth of Jesus, Thor, a figure from Norse mythology, is depicted as feeling overshadowed and even resentful that Jesus did not engage in a duel he had challenged. This rivalry represents a clash between different mythological beliefs and their followers.

The quote encapsulates the playful tone of Rick Riordan's writing in "The Sword of Summer," where gods from various mythologies exhibit human-like emotions and conflicts. It highlights the uniqueness of ancient beliefs and how they interact with one another, suggesting a world where such legendary figures coexist and react to each other's significance—or lack thereof—across time.