The quote "Never bet against a cat" from Rick Riordan's book "The Red Pyramid" suggests the idea of resilience and cunning often associated with cats. It implies that underestimating someone or something clever and agile can lead to unforeseen consequences. In a competitive or challenging situation, it’s wise to recognize the strengths of those who may appear unassuming.

This quote also resonates with themes of loyalty and unpredictability, as cats are known for their independent nature. By advising against betting against a cat, Riordan encourages readers to appreciate the unpredictable nature of life and the hidden strengths that can emerge in difficult times, underscoring a fundamental truth about courage and adaptability.