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

This quote is attributed to King Azaz.

Believe nothing you hear and only half of what you see - King Azaz

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

King Azaz Truth

Character in The Phantom Tollbooth

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"Words can be commended, debased, or ignored, but they cannot be reversed."

"You can never be too careful when choosing the words you use."

"Words are such wonderful things."

"Let me see your mind."

"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."