Sometimes when I'm alone, I take the pearl from where it lives in my pocket and try to remember the boy with the bread, the strong arms that warded off nightmares on the train, the kisses in the arena.

This quote is about someone who takes out a pearl from their pocket when they are alone. This pearl brings back memories of a boy who gave them bread, strong arms that kept them safe on the train, and of kisses they shared in the arena. The memories of these experiences bring the person comfort and joy even when they are alone.