Les femmes,” generalized Poirot. “They are marvellous! They invent haphazard — and by miracle they are right. Not that it is that, really. Women obse… - Agatha Christie

Women observe subconsciously a thousand little details, without knowing that they are doing so. Their subconscious mind adds these little things together — and they call the result intuition.

There is nothing so terrible as to live in an atmosphere of suspicion - to see eyes watching you and the love in them changing to fear - nothing so terrible as to suspect those near and dear to you - It is poisonous - a miasma.

I've never met a murderer who wasn't vain... It's their vanity that leads to their undoing, nine times out of ten. They may be frightened of being caught, but they can't help strutting and boasting and usually they're sure they've been far too clever to be caught.

“Darling,” she drawled, “won’t that be rather tiresome? If any misfortunes happen to my friends I always drop them at once! It sounds heartless, but it saves such a lot of trouble later!”