He had been fighting with himself longer than he could remember and was still not sure who was winning. - Jon Courtenay Grimwood

There was no way she could know, but Prisoner Zero asked anyway because he was talking to himself; which was all anyone ever did, it seemed to him, talk to themselves while half meanings and misunderstandings fed into the minds of those who thought they were listening.

"That's impossible," said Tris.
"Most things are," Luca said, "if you think about them for long enough."

The third nightfall was less impressive than the second, which mirrored a rule Tris had already identified; new emotions devalued, going from intense through familiar to reach a kind of ghost state where one no longer really noticed them at all.