“People who can be very good can be very bad too.”

“Love can be a very frightening thing.’ ‘That is why most great love stories are tragedies.”

“And that very same evening - that very same evening - Lord Edgware dies. Good title that, by the way. Lord Edgware Dies. Look well on a book stall.”

“Many homicidal lunatics are very quiet, unassuming people. Delightful fellows.”

“One must have common sense, nothing is permanent, nothing endures. I have come to the conclusion that this place is run by a madman. A madman, let me tell you, can be very logical. If you are rich and logical and also mad, you can succeed for a very long time in living out your illusion. But in the end....in the end this will break up. Because, you see, it is not reasonable what happens here! That which is not reasonable must always pay the reckoning in the end.~Dr. Barron”

“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.”

“You gave too much rein to your imagination. Imagination is a good servant, and a bad master. The simplest explanation is always the most likely.”