No, my friend, I am not drunk. I have just been to the dentist, and need not return for another six months! Is it not the most beautiful thought? --Poirot

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

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

It is completely unimportant. That is why it is so interesting.

Evil is not any superhuman, but it is HUMAN.

"I think you're begging the question," said Haydock, "and I can see looming ahead one of those terrible exercises in probability where six men have white hats and six men have black hats and you have to work it out by mathematics how likely it is that the hats will get mixed up and in what proportion. If you start thinking about things like that, you would go round the bend. Let me assure you of that!"

Very unfortunately, she had no husband. She had never had a husband, and therefore did not kill a husband.