Who said "Thinking is a sort of itching in the head."?

This quote is attributed to The Humbug.

Thinking is a sort of itching in the head. - The Humbug

"Thinking is a sort of itching in the head."

The Humbug Education

Character in The Phantom Tollbooth

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"How many people do you suppose have to believe something before it's true?"

"We must make the most of each moment."

"You must always be careful when thanking someone."

"Rules and regulations are all very well, but you must always act according to your conscience."

"Education opens doors."

"Education opens doors to endless possibilities."

"I ain't got the education you got, bub."

"You can't put a price on history."