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.

Everything must be taken into account. If the fact will not fit the theory---let the theory go.

I like living. I have sometimes been wildly, despairingly, acutely miserable, racked with sorrow, but through it all I still know quite certainly that just to be alive is a grand thing.

I do not argue with obstinate men. I act in spite of them.

Sitting here with one's knitting, one just sees the facts. -"The Blood-Stained Pavement

Poirot said placidly, “One does not, you know, employ merely the muscles. I do not need to bend and measure the footprints and pick up the cigarette ends and examine the bent blades of grass. It is enough for me to sit back in my chair and think. It is this – ” he tapped his egg-shaped head – “this, that functions!

Self-preservation's a man's first duty. And natives don't mind dying, you know. They don't feel about it as Europeans do.