Golding uses internal thoughts to highlight how the boys’ lives have changed on the island, which best develops the universal themes "the loss of innocence” and "the relationship between civilization and nature” in this passage. Ralph's daydreams of his previous life with his family and the comforts of civilization highlight the loss of innocence and the boys' struggle to adapt to their new, primitive environment. Additionally, the contrast between Ralph's memories and the boys' current situation on the island highlights the theme of the relationship between civilization and nature.