“It is sometimes an appropriate response to reality to go insane.”

“What he did not know then is that it is sometimes an appropriate response to reality to go insane.”

“Reality is that which, when you stop believing in it, doesn't go away.”

“Perhaps if you know you are insane then you are not insane. Or you are becoming sane, finally.”

“We're all dreaming,” Arctor said. If the last to know he's an addict is the addict, then maybe the last to know when a man means what he says is the man himself, he reflected. He wondered how much of the garbage that Donna had overheard he had seriously meant. He wondered how much of the insanity of the day--his insanity--had been real, or just induced as a contact lunacy, by the situation. Donna, always, was a pivot point of reality for him; for her this was the basic, natural question. He wished he could answer.”

“Sometimes I wish I knew how to go crazy. I forget how.”

“Fat realized that one of two possibilities existed and only two; either Dr. Stone was totally insane – not just insane but totally so – or else in an artful, professional fashion he had gotten Fat to talk; he had drawn Fat out and now knew that Fat was totally insane.”