It is the brain, the little gray cells on which one must rely. One must seek the truth within--not without." ~ Poirot

Curious things, habits. People themselves never knew they had them. [Witness for the Prosecution, also published in The Hound of Death and Other Stories.]

If only-if only, Hastings, you would part your hair in the middle instead of at the side! What a difference it would make to the symmetry of your appearance. And your moustache. If you must have a moustache, let it be a real moustache-a thing of beauty such as mine.

Difficulties are made to be overcome ~ Miss Felicity Lemon, Agatha Christie's Poirot: The Plymouth Express

It is my experience that no one, in the course of conversation, can fail to give themselves away sooner or later. Everyone has an irresistible urge to talk about themselves.

Many homicidal lunatics are very quiet, unassuming people. Delightful fellows.

Jealousy, you know, is usually not an affair of causes. It is much more-how shall I say?-fundamental than that. Based on the knowledge that one's love is not returned. And so one goes on waiting, watching, expecting...that the loved one will turn to someone else.