“It's what's in yourself that makes you happy or unhappy.”

“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.”

“Most successes are unhappy. That's why they are successes-they have to reassure themselves about themselves by achieving something that the world will notice.... The happy people are failures because they are on such good terms with themselves that they don't give a damn.”

“It's really very unpleasant. And not being able to say anything to answer back makes it rankle more, if you know what I mean.”

“Fey...a Scotch word...It means the kind of exalted happiness that comes before disaster. You know--it's too good to be true.”

“As you yourself have said, what other explanation can there be?'Poirot stared straight ahead of him. 'That is what I ask myself,' he said. 'That is what I never cease to ask myself.”

“What good is money if it can't buy happiness?”