But I know human nature, my friend, and I tell you that, suddenly confronted with the possibility of being tried for murder, the most innocent person will lose his head and do the most absurd things.

Many friends have said to me, 'I never know when you write your books, because I've never seen you writing, or even seen you go away to write.' I must behave rather as dogs do when they retire with a bone; they depart in a secretive manner and you do not see them again for an odd half hour. They return self-consciously with mud on their noses. I do much the same.

The bereaved had never any doubt about their dear ones' wishes and those wishes usually squared with their own inclinations.

It is ridiculous to set a detective story in New York City. New York City is itself a detective story.

How often have I not heard a perfectly intelligent female says, in the tone of one clinching an argument, 'Edgar says -- ' And all the time you are perfectly aware that Edgar is a perfect fool.

One is alone when the last one who remembers is gone.

I have enjoyed greatly the second blooming that comes when you finish the life of the emotions and of personal relations; and suddenly find - at the age of fifty, say - that a whole new life has opened before you, filled with things you can think about, study, or read about...It is as if a fresh sap of ideas and thoughts was rising in you.