In this quote from John Steinbeck's "Travels with Charley," the author reflects on the innate fear of the unknown. Even when rational understanding suggests that dark shadows might not be dangerous, the fear remains. The speaker acknowledges a certain helplessness that comes from the uncertainty of what might exist in the darkness. This insight reveals a profound truth about human nature: that fear often stems from the unknown rather than the known.

Furthermore, the speaker contrasts the anxiety of modern understanding with the past, where people believed in malevolent forces. Knowing these exist could provide a sense of control, as it allows for defense mechanisms like charms or prayers. The irony lies in the recognition that a lack of belief can lead to greater fear, as it leaves one vulnerable. By grappling with the intangible, the speaker emphasizes the complexities of fear and how it is intertwined with knowledge and belief.