“I realized that if I had said to them, "You had that young man turned out of the carriage because he had a second-class ticket," they would have nodded and said, "Yes," and if I had gone on and said, "But you yourselves have only second-class tickets," they would not have seen that the second statement had any bearing on the first; and I cannot picture to myself the mental life of people who cannot perceive that connexion.”