In Miguel de Cervantes' "Don Quijote of La Mancha," a significant lesson emphasizes the importance of fearing God, which leads to true wisdom. This wisdom is portrayed as a safeguard against making errors in life. The notion is that a deep reverence for God fosters understanding and sound judgment, guiding individuals to navigate their choices wisely.

Additionally, the text advises self-reflection as a vital aspect of personal growth. The challenge lies in genuinely knowing oneself rather than merely inflating one's ego. This introspective journey is portrayed as daunting yet essential, as true self-awareness is foundational to wisdom and authentic living.