At the far end of the hall a silver curtain parted and two young women stepped forward. They were dressed all in white and were beautiful beyond compare. One was grave and quiet, with a look of warm understanding in her eyes, and the other seemed gay and joyful.

"You must be the Princess of Pure Reason," said Milo, bowing to the first.

She answered simply, "Yes," and that was just enough.

"Then you are Sweet Rhyme," he said, with a smile to the other.

Her eyes sparkled brightly and she answered with a laugh as friendly as the mailman's ring when you know there's a letter for you.

"We've come to rescue you both," Milo explained very seriously.....

"It has been a long trip," said Milo, climbing onto the couch where the princesses sat; "but we would have been here much sooner if I hadn't made so many mistakes. I'm afraid it's all my fault."

"You must never feel badly about making mistakes," explained Reason quietly, "as long as you take the trouble to learn from them. For you often learn more by being wrong for the right reasons than you do by being right for the wrong reasons."

"But there's so much to learn," he said, with a thoughtful frown.

"Yes, that's true," admitted Rhyme; "but it's not just learning things that's important. It's learning what to do with what you learn and learning why you learn things at all that matters."

"That's just what I mean," explained Milo as Tock and the exhausted bug drifted quietly off to sleep. "Many of the things I'm supposed to know seem so useless that I can't see the purpose in learning them at all."

"You may not see it now," said the Princess of Pure Reason, looking knowingly at Milo's puzzled face, "but whatever we learn has purpose and whatever we do affects everything and everyone else, if even in the tiniest way. Why, when a houseful flaps his wings, a breeze goes round the world; when a spec of dust falls to the ground, the entire planet weighs a little more; and when you stamp your foot, the earth moves slightly off its course. Whenever you laugh, gladness spreads like the ripples in a pond; and whenever you're sad, no one anywhere can be really happy. And it's much the same thing with knowledge, for whenever you learn something new, the whole world becomes that much richer."

--Norton Juster, The Phantom Tollbooth