“Now that little problem of yours, this business of not knowing good men from bad men and villains from heroes and so forth...There's still plenty for you to do. And you'll do it. And when you fall in love and have a mistress or a wife and children to look after, it will all seem easier." He opened the door but stopped on the threshold. "Surround yourself with human beings, my dear. They are easier to fight for than principles." He laughed. "But don't let me down and become human yourself. We would lose such a wonderful machine." With a wave of his hand he shut the door.”