In "Lost in the Cosmos: The Last Self-Help Book," Walker Percy explores the intriguing paradox of self-perception in humanity. He highlights that a stranger can quickly assess and categorize you based on a mere glance, offering an objective evaluation of your being that you, despite your lifelong relationship with yourself, cannot fully attain. This observation emphasizes the complexity and limitations inherent in self-awareness.

The author suggests that living in the "Century of the Self" should equip individuals with a better understanding of their own identity. However, this notion is challenged by the reality that personal insight is often clouded by subjective experiences. Percy's reflection invites readers to consider the distinction between how we perceive ourselves and how others might see us, revealing the often elusive nature of true self-knowledge.