People who can be very good can be very bad too.

Who are you? You don't belong to the police?' 'I am better than the police,' said Poirot. He said it without conscious arrogance. It was, to him, a simple statement of fact.

It often seems to me that's all detective work is, wiping out your false starts and beginning again." Yes, it is very true, that. And it is just what some people will not do. They conceive a certain theory, and everything has to fit into that theory. If one little fact will not fit it, they throw it aside. But it is always the facts that will not fit in that are significant.

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.

I specialize in murders of quiet, domestic interest.

how tedious is retirement! You cannot imagine to yourself the monotony with which day comes after day.

I looked at her. Sheila was my girl--the girl I wanted--and wanted for keeps. But it wasn't any use having illusions about her. Sheila was a liar and probably always would be a liar. It was her way of fighting for survival--the quick easy glib denial. It was a child's weapon--and she'd probably never got out of using it. If I wanted Sheila, I must accept her as she was--be at hand to prop up the weak places. We've all got our weak places. Mine were different from Sheila's, but they were there.