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

Jealousy, you know, is usually not an affair of causes. It is much more-how shall I say?-fundamental than that. Based on the knowledge that one's love is not returned. And so one goes on waiting, watching, expecting...that the loved one will turn to someone else.

Fey...a Scotch word...It means the kind of exalted happiness that comes before disaster. You know--it's too good to be true.

Coffee in England always tastes like a chemistry experiment.

the science of tomorrow is the supernatural of today.

Who are you? You don't belong to the police?' 'I am better than the police,' said Poirot. He said it without conscious arrogance. It was, to him, a simple statement of fact.

The tragedy of life is that people do not change.