"If you confront anyone who has lied with the truth, he will usually admit it - often out of sheer surprise. It is only necessary to guess right to produce your effect."

"One must accept the fact that we have only one companion in this world, a companion who accompanies us from the cradle to the grave - our own self. Get on good terms with that companion - learn to liv…"

"If you are to be Hercule Poirot, you must think of everything."

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

"Never tell everything you know. It's a good way to lose friends."