Evil never goes unpunished, Monsieur. But the punishment is sometimes secret.

Nowadays, no one believes in evil. It is considered, at most, a mere negation of good. Evil, people say, is done by those who know no better - who are undeveloped - who are to be pitied rather than blamed. But, M. Poirot, evil is real! It is a fact! I believe in Evil as I believe in Good. It exists! It is powerful! It walks the earth!' He stopped. His breath was coming fast. He wiped his forehead with his handkerchief and looked suddenly apologetic. 'I'm sorry. I got carried away.

She's had a long life of experience in noticing evil, fancying evil, suspecting evil and going forth to do battle with evil.

One mustn't refuse the unusual, if it is offered to one.

I have always noticed that these artists and writers are very unbalanced

You have a great advantage as a writer, Monsieur,' said Poirot. 'You can relieve your feelings by expedient of the printed word. You have the power of the pen over your enemies.