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

“Do you not realize, Hastings, that each and everyone of us is a complete mystery with layers. We each try to judge each other, but nine times out of ten, we are wrong.”

“Liking is more important than loving. It lasts. I want what is between us to last, Luke. I don't want us just to love each other and marry and get tired of each other and then want to marry some one else.""Oh! my dear Love, I know. You want reality. So do I. What's between us will last for ever because it's founded on reality.”

“But I know human nature, my friend, and I tell you that, suddenly confronted with the possibility of being tried for murder, the most innocent person will lose his head and do the most absurd things.”

“Authors were shy, unsociable creatures, atoning for their lack of social aptitude by inventing their own companions and conversations.”

“And yet," said Poirot, "suppose an accident-""Ah, no, my friend-""From your point of view it would be regrettable, I agree. But nevertheless let us just for one moment suppose it. Then, perhaps, all these here are linked together - by death.”

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