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

The first time you do a thing is always exciting.

Our weapon is our knowledge. But remember, it may be a knowledge we may not know that we possess.

Everyone likes talking about himself. - Hercule Poirot

The amount of missing girls I've had to trace and their family and their friends always say the same thing. 'She was a bright and affectionate disposition and had no men friends'. That's never true. It's unnatural. Girls ought to have men friends. If not, then there's something wrong about them.

Doctors can do almost anything nowadays, can't they, unless they kill you while they're trying to cure you.

Bottled, was he?" Said Colonel Bantry, with an Englishman's sympathy for alcoholic excess. "Oh, well, can't judge a fellow by what he does when he's drunk? When I was at Cambridge, I remember I put a certain utensil - well - well, nevermind.