The truth doesn’t matter,” Pip said, digging her nails into her thigh. The Pip from last year wouldn’t recognize this one today. That lively-eyed girl and her school project, naively clinging to the truth, wrapping it around herself like a blanket. But the Pip sitting here was a different person and she knew better. The truth had burned her too many times; it couldn’t be trusted
-- Pip (Chapter 6)

Importance: The "good girl" Pip was at the beginning of the series morphs into a vigilante in this novel. This quote is important because it shows her jaded cynicism with the justice system because she no longer believes that the truth will prevail within its walls.

She’d thought the same thing about herself not so long ago, and yet his words still felt like a punch to the gut. Why had she allowed herself even a shred of hope that this...
-- Pip (Chapter 10)