The BFG highlights a significant trait of humans, stating that they tend to dismiss anything they cannot see with their own eyes. This skepticism limits their understanding and appreciation of things that exist beyond their immediate perception. The character uses a humorous way of expressing this sentiment, referring to humans as "human beans" and "schnozzles," indicating a whimsical view of human behavior.

Through this quote, Roald Dahl critiques the narrow-mindedness often observed in people, suggesting that an open mind is essential for belief and imagination. The BFG represents a different perspective, embracing wonder and the unseen, urging readers to explore beyond the confines of their visual experiences and societal norms.