Who said "Work's only worth doing if it helps someone."?

This quote is attributed to Mater.

Work's only worth doing if it helps someone. - Mater

"Work's only worth doing if it helps someone."

Mater Work

"I'm a tractor tippin' fool!"

"Dadgum!"

"Well, I'll be!"

"You're my best friend!"

"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."