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

Who are you? You don't belong to the police?' 'I am better than the police,' said Poirot. He said it without conscious arrogance. It was, to him, a simple statement of fact.

It's astonishing in this world how things don't turn out at all the way you expect them to.

No sign, so far, of anything sinister—but I live in hope.

... evil was, perhaps, necessarily always more impressive than good.

Many years ago, when I was once saying sadly to Max it was a pity I couldn't have taken up archaeology when I was a girl, so as to be more knowledgeable on the subject, he said, 'Don't you realize that at this moment you know more about prehistoric pottery than any woman in England?'

But surely for everything you love you have to pay some price.