Who said "Knowledge is only useful if you know how to use it."?

This quote is attributed to The Mathemagician.

Knowledge is only useful if you know how to use it. - The Mathemagician

"Knowledge is only useful if you know how to use it."

The Mathemagician Wisdom

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."

"I'm not angry, I'm just disappointed."

"The best things in life are free."

"You can't have everything in life, but you can have what matters most."

"A woman's intuition is rarely wrong."