Who said "Believe nothing you hear and half of what you see."?

This quote is attributed to The Humbug.

Believe nothing you hear and half of what you see. - The Humbug

"Believe nothing you hear and half of what you see."

The Humbug Truth

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."

"Lucy, you got some 'splainin' to do!"

"You must always be honest with the people you love."

"Truth always comes out in the end."

"Honesty is always the best policy."