Who said "Kindness costs nothing but provides everything."?

This quote is attributed to The Humbug.

Kindness costs nothing but provides everything. - The Humbug

"Kindness costs nothing but provides everything."

The Humbug Kindness

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."

"A good man treats his wife with respect."

"Kindness always comes back around."

"The power of a smile can change everything."

"Kindness is weakness to some. Not to me."