They seemed to have the idea that deliberately changing a person would somehow reduce that person's humanity. Most people are quite willing to change themselves deliberately with antibiotics and cosmetics, but behavior seems different. I've never understood how changing someone and making them happier turns them into less of a human being. But I have noticed how many people are very good at making their husbands or wives or children — or even total strangers — feel bad, just by "being themselves." I sometimes ask people, "Why be your real self when you can be something really worthwhile?" I want to introduce you to some of the infinite possibilities for learning and changing that are available to you if you start using your brain deliberately.

There was a time when film producers made movies in which computers were going to take over. People started thinking of computers not as tools, but as things that replaced people. But if you have seen home computers, you know that they have programs for things like balancing your checkbook! Balancing your checkbook on a home computer takes about six times as long as doing it the usual way. Not only do you have to write them in the checkbook, then you have to go home and type them into the computer. That's what turns home computers into planters —the things that you put flowers in. You play a certain number of games when it's a new toy, and after a while you stick it away in the closet. When friends come over whom you haven't seen for a long time, you pull it out so they can play the games you're bored with. That is not really what a computer is about. But the trivial ways people have used computers are much like the trivial ways in which people have used their own minds.

I keep hearing people say that you stop learning when you're about five, but I have no evidence that this is true. Stop and think about it. Between the ages of five and now, how many absolutely futile things have you learned, let alone worthwhile ones? Human beings have an amazing ability to learn. I am convinced, and I'm going to convince you — one way or the other — that you're still a learning machine. The good side of this is that you can learn things exquisitely and rapidly. The bad side is that you can learn garbage just as easily as you can learn useful things.