“Our weapon is our knowledge. But remember, it may be a knowledge we may not know that we possess.”

“The trouble with you and me, is that we don't live in the real world. We dream of fantastic things that may never happen.”

“Fear is incomplete knowledge”

“Elephants can remember, but we are human beings and mercifully human beings can forget.”

“Melchett said gloomily, 'Well, we know where we are -- or rather, where we aren't!''Where we aren't expresses it rather better, sir.”

“... one may live in a big house and yet have no comfort.”

“I've heard that you're the cat's whiskers, M. Poirot.""Comment? The cat's whiskers? I do not understand.""Well that you're It.""Madame, I may or may not have brains - as a matter of fact I have - why pretend?”