In "The Son of Neptune" by Rick Riordan, the theme of enduring hardship to achieve greater rewards is encapsulated in the quote "Eat bitter, taste sweet." This notion suggests that facing challenges and overcoming obstacles can lead to fulfilling and positive outcomes. The characters in the story confront significant struggles, which ultimately contribute to their growth and development.
The journey of the protagonists illustrates the idea that what initially feels difficult or unpleasant can lead to something rewarding. Their experiences serve as a testament to the value of perseverance and resilience, reinforcing that despite the bitterness of life's trials, the sweetness of success awaits those who push through adversity.