Final answer:
The theme of The Book of the Dead revolves around the afterlife, judgement, and the pursue of eternal life, emphasizing the democratization of access to the divine in ancient Egyptian society.
Step-by-step explanation:
The theme of the book 'The Book of the Dead' is death and the afterlife. It explores the ancient Egyptian beliefs and rituals surrounding death and the journey of the soul to the underworld. One example of textual evidence for this theme is the representation of Osiris, the god of the afterlife, in the tomb scenes. Another example is the mention of the underworld and the beliefs about the world below in the text from Tacitus' Histories Book 5.