Who said "Motivation comes from within; no one can give it to you."?

This quote is attributed to Missandei.

Motivation comes from within; no one can give it to you. - Missandei

"Motivation comes from within; no one can give it to you."

Missandei Motivation

"I am Missandei of Naath, interpreter and advisor to the Dragon Queen."

"Daenerys Targaryen chose to free us, not because she needed us, but because it was right."

"Knowledge is power, but wisdom is knowing how to use it."

"I have served many masters, but I chose to serve the Mother of Dragons."

"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."