Who said "If something's hard to do, then it's not worth doing."?

This quote is attributed to Bart Simpson.

If something's hard to do, then it's not worth doing. - Bart Simpson

"If something's hard to do, then it's not worth doing."

Bart Simpson Motivation

"Eat my shorts!"

"Ay caramba!"

"Don't have a cow, man."

"Cowabunga!"

"I believe in working hard for what you want."

"Never underestimate the power of determination."

"I don't need a reason to fight."

"The most important thing is the mission. Nothing else matters."