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!
And yet," said Poirot, "suppose an accident-" "Ah, no, my friend-" "From your point of view it would be regrettable, I agree. But nevertheless let us just for one moment suppose it. Then, perhaps, all these here are linked together - by death.
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.
There is nothing so dangerous for anyone who has something to hide as conversation!... A human being, Hastings, cannot resist theopportunity to reveal himself and express his personality which conversation gives him. Every time he will give himself away.
To put it quite crudely ... the poor don't really know how the rich live, and the rich don't know how the poor live, and to find out is really enchanting to both of them.