Why would we do this? she asked, watching smoke trickle towards the ceiling. A whole world of rigid rules covering temperature, convection and Browni… - 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.

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

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.