“Inside every lump of coal there's a diamond waiting to get out.”

“Inside every sane person there's a madman struggling to get out," said the shopkeeper. "That's what I've always thought. No one goes mad quicker than a totally sane person.”

“Somewhere deep inside his mind, somewhere beyond the event horizon of rationality, the sheer pressure of insanity had hammered his madness into something harder than diamond.”

“I'll be more enthusiastic about encouraging thinking outside the box when there's evidence of any thinking going on inside it.”

“...inside every old person is a young person wondering what happened.”

“The truth may be out there, but the lies are inside your head.”

“Sometimes glass glitters more than diamonds because it has more to prove.”