“I believe, Messieurs, in loyalty---to one's friends and one's family and one's caste.”

“Mrs. Cavendish: I am charming to my friends one day, and forget all about them the next.”

“Do you know my friend that each one of us is a dark mystery, a maze of conflicting passions and desire and aptitudes?”

“One of the oddest things in life I think is the things one remembers.”

“What I feel is that if one has got to have a murder actually happening in one's house, one might as well enjoy it, if you know what I mean.”

“I always think loyalty's such a tiresome virtue. ”

“Life can be very terrible," he said. "One needs much courage.""To kill oneself? yes, I suppose one does.""Also to live," said Poirot, "one needs courage.”