What I Am Reading

From Madeleine L'Engle's "Love Letters":

"Supposing," she said, slowly, "you were sitting in a train standing still in a great railroad station. And supposing the train on the track next to yours began to move. It would seem to you that it was your train that was moving, and in the opposite direction. The only way you could tell about yourself, which way you were going, or even if you were going anywhere at all, would be to find a point of reference, something standing still, perhaps a person on the next platform; and in relation to this person you could judge your own direction and motion. The person standing still on the platform wouldn't be telling you where you were going or what was happening, but without him you wouldn't know. You don't need to yell out the train window and ask directions. All you need to do is see your point of reference."