In "The Glass Castle" by Jeannette Walls, the author emphasizes that formal education is not the only way to gain knowledge and understanding of the world. She suggests that being observant and attentive can provide valuable insights that rival those acquired through traditional schooling. This idea highlights the importance of self-education and the power of curiosity in shaping one's perspective.

Walls' narrative illustrates her own experiences where she learns about resilience, survival, and the complexities of family life outside the confines of a classroom. It serves as a reminder that wisdom often comes from life experiences rather than textbooks, encouraging readers to embrace their unique journeys of learning.