"Some of them will, as the case of my granddaughter demonstrates. But 
what does it really mean when such a young
person moves to another phyle? It means that they have outgrown youthful 
credulity and no longer wish to belong to a tribe simply because it is 
the path of least resistance—they have developed principles, 
they are concerned with their personal integrity. It means, in short, 
that they are ripe to become members in good standing of New 
Atlantis—as soon as they develop the wisdom to see that it 
is, in the end, the best of all possible tribes."