Evil is not something superhuman, it's something less than human.

Do you know my friend that each one of us is a dark mystery, a maze of conflicting passions and desire and aptitudes?

Hercule Poirot: I am an imbecile. I see only half of the picture. Miss Lemon: I don't even see that.

a great man always knows better than to explain unless an explanation is demanded. To rush into explanations and excuses is always a sign of weakness.

One of the luckiest things that can happen to you in life is, I think, to have a happy childhood.

If anyone is really determined to lend you a book, you never can get out of it!

I can't imagine why everybody is always so keen for authors to talk about writing. I should have thought it was an author's business to write, not talk.