"In all affairs, it's a healthy thing now and then to hang a question mark on the things you have long taken for granted."

"The whole problem with the world is that fools and fanatics are always so certain of themselves, and wiser people so full of doubts."

"I hate being all tidy like a book in a library where nobody reads – prison is horribly like that."

"To think I have spent my life on absolute muck."

"The fundamental cause of the trouble is that in the modern world the stupid are cocksure while the intelligent are full of doubt."