Who said "Motivation come from within, not from outside."?

This quote is attributed to Hulk.

Motivation come from within, not from outside. - Hulk

"Motivation come from within, not from outside."

Hulk Motivation

"Hulk is strongest one there is."

"Don't make me angry. You wouldn't like me when I'm angry."

"Puny god."

"Hulk smash!"

"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."