Who said "The goal is to leave things better than you found them."?

This quote is attributed to Hawkeye / Clint Barton.

The goal is to leave things better than you found them. - Hawkeye / Clint Barton

"The goal is to leave things better than you found them."

Hawkeye / Clint Barton

"I'm just a guy with a bow and arrow."

"Sometimes the smallest things take up the most room in your heart."

"You know what the problem is? You're always looking for the next big thing, when sometimes it's right in front of you."

"I can't miss. Well, I can miss, but I don't very often."