Weak and kindly people are often very treacherous. And if they’ve got a grudge against life it saps the little moral strength that they may possess. - Agatha Christie

“I like to see an angry Englishman,” said Poirot. “They are very amusing. The more emotional they feel the less command they have of language.”

Love is not everything, Mademoiselle,' Poirot said gently. 'It is only when we are young that we think it is.

"Poirot's eyes opened. "That is great ferocity," he said.

"It is a woman," said the chef de train, speaking for the first time. "Depend upon it, it was a woman. Only a woman would stab like that."

Dr. Constantine screwed up his face thoughtfully. "She must have been a very strong woman," he said. "It is not my desire to speak technically-that is only confusing; but I can assure you that two of the blows were delivered with such forces as to drive them through hard belts of bone and muscle."

"It was clearly not a scientific crime," said Poirot.

"It was most unscientific," returned Dr. Constantine.

"The blows seem to have been delivered haphazard and at random. Some have glanced off, doing hardly any damage. It is as though somebody had shut his eyes and then in a frenzy struck blindly again and again."

"C'est une femme," said the chef de train again. "Women are like that. When they are enraged they have great strength." He nodded so sagely that everyone suspected a personal experience of his own."