In Cormac McCarthy's novel "Blood Meridian," the quote addresses the complexity of self-awareness and understanding one's thoughts. It suggests that when a person struggles to grasp their own beliefs or feelings, it may be due to the limitations of relying solely on their mind, which can be a perplexing and sometimes deceptive entity. This illustrates how the mind can be both a tool and a barrier in the quest for self-knowledge.

The quote implies that true understanding of oneself goes beyond mere thoughts and mental reflection. It hints at the idea that introspection may not always yield clarity, as the mind can be clouded by doubt or confusion. Thus, McCarthy emphasizes the challenges of self-discovery, suggesting that individuals must grapple with their thoughts and emotions to attain a deeper comprehension of their own identities.