“It is the quietest and meekest people who are often capable of the most sudden and unexpected violence for the reason that when their control does snap, it goes entirely.”

“My friend, in working upon a case, one does not take into account only the things that are "mentioned". There is no reason to mention many things which may be important. Equally, there is often an excellent reason for not mentioning them.”

“The point is that one's got an instinct to live. One does not live because one's reason assents to living. People who, as we say, 'would be better dead,' don’t want to die! People who apparently have got everything to live for just let themselves fade out of life because they have not got the energy to fight.”

“Nowadays, no one believes in evil. It is considered, at most, a mere negation of good. Evil, people say, is done by those who know no better - who are undeveloped - who are to be pitied rather than blamed. But, M. Poirot, evil is real! It is a fact! I believe in Evil as I believe in Good. It exists! It is powerful! It walks the earth!' He stopped. His breath was coming fast. He wiped his forehead with his handkerchief and looked suddenly apologetic. 'I'm sorry. I got carried away.”

“People will quite often do anything for money. - Jane Marple”

“But I know human nature, my friend, and I tell you that, suddenly confronted with the possibility of being tried for murder, the most innocent person will lose his head and do the most absurd things.”

“Ah, but life is like that! It does not permit you to arrange and order it as you will. It will not permit you to escape emotion, to live by the intellect and by reason! You cannot say, 'I will feel so much and no more.' Life, Mr. Welman, whatever else it is, is not reasonable. [Hercule Poirot]”