“Because what she dreaded now, ever since that walk down Lexington Avenue, was that the illness that had possessed, transformed, and consumed her father might also be at work in her brain. She could feel herself think differently and knew that, in the end, it did not matter whether this feeling was based on reality or fantasies. What mattered was that she was unable to stop thinking about her thoughts. Her speculations reflected one another, like parallel mirrors- and, endlessly, each image inside the vertiginous tunnel looked at the next wondering whether it was the original or a reproduction. This, she told herself, was the beginning of madness. The mind becoming the flesh for its own teeth.”
Book:Trust