Who said "I serve not because I must, but because I will it."?

This quote is attributed to Grey Worm.

I serve not because I must, but because I will it. - Grey Worm

"I serve not because I must, but because I will it."

Grey Worm Motivation

"I am Grey Worm. I have no name."

"Unsullied do not fear death."

"We are the dragons' soldiers."

"A soldier's duty is to obey."

"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."