Who said "Gratitude is the mark of a noble soul."?

This quote is attributed to Indy.

Gratitude is the mark of a noble soul. - Indy

"Gratitude is the mark of a noble soul."

Indy Gratitude

"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."

"Gratitude makes life richer."

"A grateful heart is a happy heart."

"Respect those who came before us."

"Life's greatest treasures are the people we love"