Who said "Motivation comes from within, not from other people."?

This quote is attributed to Brittany Taylor.

Motivation comes from within, not from other people. - Brittany Taylor

"Motivation comes from within, not from other people."

Brittany Taylor Motivation

"I'm not dumb, I just don't apply myself."

"Why should I care what anyone thinks?"

"Like, whatever."

"I'm actually smart, I just choose not to show it."

"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."