In "The Lightning Thief," Rick Riordan explores the theme of individual morality and the impact of choices on life. The quote highlights a sense of disillusionment with humanity, suggesting that many people fail to make positive contributions during their lives. This perspective can lead to a feeling of sadness or a lack of hope for the future, as it reflects a belief that good deeds are rare.

The author uses this sentiment to deepen the protagonist's journey, illustrating the challenges faced in a world where acts of kindness are overshadowed by negativity. Through the character's adventures, Riordan invites readers to consider their own actions and the legacy they want to leave behind. Despite the melancholy in the quote, the narrative ultimately emphasizes the importance of striving for goodness and making a difference, however small.