If you want someone to tell you what to think," the phantom answered briskly, without looking up, "you will never be short of people willing to do so. ". . . "Come now," he said at last, "you can hardly claim that I have left you ignorant. I taught you to read, did I not?
Our minds thus grow in spots; and like grease spots, the spots spread. But we let them spread as little as possible: we keep unaltered as much of our old knowledge, as many of our old prejudices and beliefs, as we can.