Who said "Hard work yields its own rewards."?

This quote is attributed to Indy.

Hard work yields its own rewards. - Indy

"Hard work yields its own rewards."

Indy Work

"It's not the years, honey, it's the mileage."

"Fortune and glory, kid."

"Snakes. Why'd it have to be snakes?"

"That's how we archaeologists tell time."

"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."