In Rick Riordan's novel, "The Lightning Thief," the concept of destiny plays a crucial role in shaping the characters' journeys. The quote "All we can do, child, is follow our destiny" encapsulates the underlying theme of accepting one's path in life, despite the challenges and uncertainties that may arise. It emphasizes the idea that fate is a guiding force that the characters must navigate as they encounter trials and adventures.

This perspective on destiny encourages readers to reflect on their own lives and the forces that guide their decisions. As the protagonist embarks on a quest filled with mythical beings and significant hurdles, the acknowledgment of destiny highlights the importance of embracing one's identity and purpose while being proactive in shaping their future, rather than resigning to fate alone.