You don't realize what fine fighting material there is in age. ... You show me any one who's lived to over seventy and you show me a fighter - some one who's got the will to live.

I did not deceive you, mon ami. At most, I permitted you to deceive yourself.

Poirot said placidly, “One does not, you know, employ merely the muscles. I do not need to bend and measure the footprints and pick up the cigarette ends and examine the bent blades of grass. It is enough for me to sit back in my chair and think. It is this – ” he tapped his egg-shaped head – “this, that functions!

An archaeologist is the best husband a woman can have. The older she gets the more interested he is in her.

In old days the public didn't really mind much about accuracy, but nowadays readers take it upon themselves to write to authors on every possible occasion, pointing out flaws.

Elephants can remember, but we are human beings and mercifully human beings can forget.

I am not one to rely upon the expert procedure. It is the psychology I seek, not the fingerprint or the cigarette ash.