How we cite our quotes: (Chapter.Paragraph)
Quote #4
She remembered other years, when she had stood with her parents, too short to see the Songmaster's signal, too short to see anything but people's backs and legs, and waited for the first note to thunder out. She felt her heart move at that moment, every year. (16.40)
The Singing is such an important event in the lives of Ember's citizens that everyone remembers it and has emotional associations with it. For Lina, those associations include memories of her parents, now dead.
Quote #5
But suddenly, with a flash of joy, he remembered: he didn't have to wait for the lights to come back on. He had what no citizen of Ember had ever had before—a way to see in the dark. (17.11)
Old habits die hard, since you basically have to retrain your brain to override past memories of how to operate. This is true for Doon as much as anyone else in Ember, since they've spent their whole lives without portable lights, and it was mere days ago that Doon and Lina discovered the candles and matches that the Builders had stashed away safely.
Quote #6
"They're expecting us!" said Lina. "Well, they wrote this a long time ago," Doon said. "The people who put it here must all be dead by now." "That's true. But they wished us good fortune. It makes me feel as if they're watching over us." (19.4-6)
Nothing like a message from dead people to make you feel connected to the past. In this case, it's a sign from the Builders, welcoming the refugees from Ember to the path to their new home.