" Yes, yes, I know. Life is like a train, Mademoiselle. It goes on. And it is a good thing that that is so.” “Why?” “Because the train gets to its journey’s end at last, and there is a proverb about that in your language, Mademoiselle.” “ ‘Journeys end in lovers meeting.’ ” Lenox laughed. “That is not going to be true for me.” “Yes—yes, it is true. You are young, younger than you yourself know. Trust the train, Mademoiselle, for it is le bon Dieu who drives it. "

― Agatha Christie , The Mystery of the Blue Train (Hercule Poirot, #5)