In William Faulkner's novel "As I Lay Dying," a character expresses deep existential uncertainty with the quote, "I don't know what I am. I don't know if I am or not." This statement reflects an internal struggle with identity and existence, highlighting feelings of confusion and doubt that can plague individuals. The character's introspection raises questions about self-awareness and the search for meaning in one's life.

This quote encapsulates the broader themes of the novel, which explores the complexities of family dynamics and the human condition. Faulkner's use of stream-of-consciousness narration allows readers to delve into the psyche of his characters, illustrating their struggles with acceptance and understanding. Ultimately, the phrase signifies a universal aspect of the human experience, where one's sense of self can often feel elusive and ambiguous.