In Philip K. Dick's novel "The Man in the High Castle," the theme of blood as an indelible trait is illustrated through the quote "Blood, Herr Reiss, can never be eradicated like ink." This emphasizes the idea that one's heritage or identity is inherent and cannot be easily changed or erased. The notion of blood symbolizes deeper connections to culture, history, and the struggles faced by individuals, suggesting that these elements are fundamental to the human experience.

The quote also reflects the broader conflicts within the novel, including personal and societal tensions brought about by oppressive regimes. Characters grapple with their identities in a world dominated by authoritarian control, and the concept of blood serves as a reminder of the reality of their origins. Ultimately, Dick’s work challenges readers to consider the lasting impact of background and history on the present, demonstrating that certain aspects of ourselves are enduring and cannot simply be washed away.