"It's a wonderful thing to be clever, and you should never think otherwise, 
and you should never stop being that way. But what you learn, as you get older, 
is that there are a few billion other people in the world all trying to be 
clever at the same time, and whatever you do with your life will certainly be 
lost—swallowed up in the ocean—unless you are doing it along with 
like-minded people who will remember your contributions and carry them forward. 
That is why the world is divided into tribes. There are many Lesser phyles and 
three Great ones. What are the Great ones?"