Who said "But you must learn to be content with the world as it is."?

This quote is attributed to The Mathemagician.

But you must learn to be content with the world as it is. - The Mathemagician

"But you must learn to be content with the world as it is."

The Mathemagician

Character in The Phantom Tollbooth

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"Numbers are just as important as words."

"It's not how much you know that matters, but how you use it."

"You can't improve if you don't try."

"The only way to see things as they really are is to look at them as they truly were."