Many friends have said to me, 'I never know when you write your books, because I've never seen you writing, or even seen you go away to write.' I must behave rather as dogs do when they retire with a bone; they depart in a secretive manner and you do not see them again for an odd half hour. They return self-consciously with mud on their noses. I do much the same.

Does the real thing ever have the perfection of a stage performance?

Instinct is a marvelous thing. It can neither be explained nor ignored.

I would like it to be said that I was a good writer of detective and thriller stories.

You've a pretty good nerve," said Ratchett. "Will twenty thousand dollars tempt you?" It will not." If you're holding out for more, you won't get it. I know what a thing's worth to me." I, also M. Ratchett." What's wrong with my proposition?" Poirot rose. "If you will forgive me for being personal - I do not like your face, M. Ratchett," he said.

He was very much a man of moods, possibly owing to what is styled the artistic temperment. I have never seen, myself, why the possession of artistic ability should be supposed to excuse a man from a decent exercise of self-control.

To count - really and truly to count - a woman must have goodness or brains.