“I just woke up feeling happy this morning. You know those days when everything in the world seems right.”

“People with a grudge against the world are always dangerous. They seem to think life owes them something. I've known many an invalid who has suffered worse and been cut off from life much more . . . and they've managed to lead happy contented lives. It's what's in yourself that makes you happy or unhappy.”

“You do think you know about everything," said her husband. I do," said Tuppence.”

“I was wrong about that young man of yours. A man when he is making up to anybody can be cordial and gallant and full of little attentions and altogether charming. But when a man is really in love, he can't help looking like a sheep. Now, whenever that young man looked at you, he looked like a sheep. I take back all I said this morning. It is genuine.”

“You start into it, inflamed by an idea, full of hope, full indeed of confidence. If you are properly modest, you will never write it at all, so there has to be one delicious moment when you have thought of something, know just how you are going to write it, rush for a pencil, and start buoyed up with exaltation. You then get into difficulties, don’t see your way out, and finally manage to accomplish more or less what you first meant to accomplish, though losing confidence all the time. Having finished it, you know it is absolutely rotten. A couple of months later, you wonder if it may not be all right after all.”

“My dear Poirot, it's not for me to dictate to you. You have a right to your own opinion, just as I have mine.”

“You're very young...you haven't got to that yet. But it does come! The blessed relief when you know that you've done with it all - that you haven't got to carry the burden any longer. You'll feel that too someday...”