In "The Real Life of Sebastian Knight," Vladimir Nabokov explores the complexities of identity and self-perception through the character of Sebastian. The notion expressed in the quote highlights the fluidity of identity, suggesting that one can be defined in multiple ways or perhaps not at all, leading to confusion regarding one's true self. This reflects on the struggle to understand personal identity, as the narrator grapples with the enigma that is Sebastian Knight.

The interplay between the narrator and Sebastian reveals deeper themes of existence, art, and the pursuit of meaning in life. By questioning who they both are, the novel invites readers to consider how perception shapes our understanding of others and ourselves. The journey of discovery and the search for clarity not only underscore the story but also resonate with universal themes of human experience and introspection.