In Jodi Picoult's book "Between the Lines," a central theme revolves around the idea that happiness can often be found by lowering one's expectations. This concept suggests that by not holding onto high hopes or unrealistic standards, individuals can appreciate their current circumstances better and find contentment in their lives.

The story encourages readers to reflect on their desires and the pressure to achieve certain ideals. It emphasizes that by adjusting our expectations, we can create a more fulfilling and joyful experience in our daily lives, leading to a more profound sense of satisfaction.