Who said "If something is worth doing, it's worth overdoing."?

This quote is attributed to The Humbug.

If something is worth doing, it's worth overdoing. - The Humbug

"If something is worth doing, it's worth overdoing."

The Humbug Work

Character in The Phantom Tollbooth

Buy "The Phantom Tollbooth" on Amazon

"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."

"Hard work never killed anybody."

"Work with purpose and integrity."

"Hard work pays off in the end."

"A man's gotta do what a man's gotta do."