"I have always been a great admirer of Hercule Poirot."

"The young people think the old people are fools -- but the old people know the young people are fools."

"To know when to use the truth is the essence of successful deception."

"The best time for planning a book is while you're doing the dishes."

"Human nature, dear, is very much the same everywhere. It is more difficult to observe it closely in a city, that is all."