If the little grey cells are not exercised, they grow the rust. - Agatha Christie

The illusion that freedom is the prerogative of one’s own particular race is fairly widespread. Dr Gerard was wiser. He knew that no race, no country and no individual could be described as free. But he also knew that there were different degrees of bondage.

Tout de même, it is not necessary that he should be killed on the Orient Express. There are other places.

There was only one thing about his own appearance which really pleased Hercule Poirot, and that was the profusion of his moustaches, and the way they responded to grooming and treatment and trimming. They were magnificent. He knew of nobody else who had any moustache half as good.