In Tuck Everlasting, the pond helps Winnie understand why never dying is not so great as it first sounds. Angus Tuck first takes Winnie out on the rowboat in chapter 12. He shows her how the water is always moving and how nature is moving around them, but the rowboat is still. He uses this as a metaphor for his family's life: that everything is moving around them like a wheel, but they are stuck. Winnie must contemplate the idea of death. Everything is supposed to grow old and die at some point. Winnie is a young girl, and all these thoughts and emotions are very overwhelming for her. She spends the night with the Tuck family, thinking it all over.
In chapter 17, Winnie wakes up the next morning. This time, Miles takes her out on the rowboat. They go fishing in the pond. Winnie again must think about the circle of life and how death is a part of that. At first it troubles her. Even the thought of animals eating other animals is a bit upsetting:
"It'd be nice," she said, "if nothing ever had to die."
"Well, now, I don't know," said Miles. "If you think on it, you come to see there'd be so many creatures, including people, we'd all be squeezed in right up next to each other before long."
Winnie squinted at her fishing line and tried to picture a teeming world. "Mmm," she said, "yes, I guess you're right."
She is kind of glad when the fish gets away from her pole, but Miles reminds her that you can't put off death forever. After all these thoughts mulling in her mind, it is a mosquito that helps Winnie make her final decision:
A mosquito appeared and sat down on Winnie's knee. She slapped at it absently, thinking about what Miles had said. If all the mosquitoes lived forever—and if they kept on having babies!—it would be terrible. The
Tucks were right. It was best if no one knew about the spring, including the mosquitoes. She would keep the secret.