"You ain’t poisoned mad? You don’t hate nobody? They didn’ do nothin’ in that jail to rot you out with crazy mad?" He looked sidewise at her, studied her, and his eyes seemed to ask how she could know such things.
– John Steinbeck
The Grapes of Wrath, Chapter 8. Ma Joad is concerned how life in prison may have affected her son Tom. She is afraid that it may have turned his mind mad. But when she looks into his eyes she sees that he is still the same Tom.