One is alone when the last one who remembers is gone.

It's astonishing in this world how things don't turn out at all the way you expect them to.

It is curious - but you cannot make a revolution without honest men. ... Every revolution has had its honest men. They are soon disposed of afterwards.

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.

As you yourself have said, what other explanation can there be?' Poirot stared straight ahead of him. 'That is what I ask myself,' he said. 'That is what I never cease to ask myself.

Evil never goes unpunished, Monsieur. But the punishment is sometimes secret.

Of course I despise money when I haven't got any. It's the only dignified thing to do.