“A slightly uncommon condition of the some-long-word. Nothing at all serious, but it just needs putting right. A simple treatment.”

“Marriage, I have always held, is a serious affair, to be entered into only after long deliberation and forethought, and suitability of tastes and inclinations is the most important consideration.”

“Some of us, in the words of the divine Greta Garbo, want to be alone.”

“Too much mercy... often resulted in further crimes which were fatal to innocent victims who need not have been victims if justice had been put first and mercy second.”

“To every problem, there is a most simple solution.”

“About Miss Debenham," he said rather awkwardly. "You can take it from me that she's all right. She's a pukka sahib."What," asked Dr. Constantine with interest, "does a pukka sahib mean?""It means," said Poirot, "that Miss Debenham's father and brothers were at the same kind of school as Colonel Arbuthnot was.""Oh!" said Dr. Constantine, disappointed. "Then it has nothing to do with the crime at all.""Exactly," said Poirot.”

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