It is frightfully difficult to know much about the fairies, and almost the only thing for certain is that there are fairies wherever there are children.

The moment you doubt whether you can fly, you cease for ever to be able to do it.

All children, except one, grow up

he decided to appeal to the fairies for enlightenment. They are reputed
to know a good deal.

Thus, when you cry out, 'Greedy! Greedy!' to the bird that flies
away with the big crust, you know now that you ought not to do this, for he is very likely taking it to Peter
Pan.

For otherwise he would have lost faith in his power to fly, and
the moment you doubt whether you can fly, you cease for ever to be able to do it.