Who said "Motivation comes from within, nobody can give it to you."?

This quote is attributed to The Thing.

Motivation comes from within, nobody can give it to you. - The Thing

"Motivation comes from within, nobody can give it to you."

The Thing Motivation

"It's clobberin' time!"

"I'm a walking pile of rocks, but I got heart!"

"Somebody's gotta look out for the little guy."

"I ain't pretty, but I got brains."

"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."