“I disdained to argue, and entrenched my curiosity behind a rampart of pretended indifference.”

“Human curiosity. Such a very interesting thing. Think of what we owe to it throughout history. It is said to be usually associated with the cat. Curiosity killed the cat. But I should say really that the Greeks were the inventors of curiosity.”

“I do not argue with obstinate men. I act in spite of them.”

“She looked at nobody, but just before she went out, she raised her eyes and took a speedy glance at me. There was something in that looks that startled me - though it was difficult to describe why. There was malice in it, and a curious intimate knowledge. I felt that, without effort, and almost without curiosity, she had known exactly what thoughts were in my mind.”

“I've heard that you're the cat's whiskers, M. Poirot.""Comment? The cat's whiskers? I do not understand.""Well that you're It.""Madame, I may or may not have brains - as a matter of fact I have - why pretend?”

“I avoided my own friends and acquaintances, yet the loneliness of my existence was insupportable.”

“Poirot," I said. "I have been thinking.""An admirable exercise my friend. Continue it.”