We change channels like a television. We selectively filter
available information from reality, paying particular attention to the part we are "tuned" to receive. Using this model, the five blind brothers in our story were each tuned to receive a different part of the elephant. But you and I do much more than that. In addition to selectively attending to parts of the input, we also assign those parts meaning.
Different beliefs, different meanings. Consider, for example, how half the people at a game can feel extremely happy about the game while the other half are equally depressed. They are reacting to the same external reality, but in radically different ways. They react differently because they have different beliefs; half the crowd believes it's vitally important for team "A" to win, the other half is just as convinced that team "B" should trounce the despicable team "A" opponents. It would seem that at least half the crowd is doomed to disappointment. But wait! There may be a way out. If the team you have been rooting for is clearly losing, you can switch your allegiance. By shifting your allegiance to the winning team, you magically go from sad to glad. You may be a weasel, but at least you're a happy weasel. The point is that by changing a belief you can improve how you feel about external events. Maybe there's good reason to not abandon our team in a time of need, but there are many other beliefs that are arbitrary, and can be changed for the better.