There's nothing so dangerous for anyone who has something to hide as conversation.

I believe, Messieurs, in loyalty---to one's friends and one's family and one's caste.

Plots come to me at such odd moments, when I am walking along the street, or examining a hat shop… suddenly a splendid idea comes into my head.

Women can accept the fact that a man is a rotter, a swindler, a drug taker, a confirmed liar, and a general swine, without batting an eyelash, and without its impairing their affection for the brute in the least. Women are wonderful realists.

That is why most great love stories are tragedies.

One is left with the horrible feeling now that war settles nothing; that to win a war is as disastrous as to lose one.

It often seems to me that's all detective work is, wiping out your false starts and beginning again." Yes, it is very true, that. And it is just what some people will not do. They conceive a certain theory, and everything has to fit into that theory. If one little fact will not fit it, they throw it aside. But it is always the facts that will not fit in that are significant.