Who said "A man's worth is not measured by his origin."?

This quote is attributed to Grey Worm.

A man's worth is not measured by his origin. - Grey Worm

"A man's worth is not measured by his origin."

Grey Worm Justice

"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."

"Justice must always prevail."

"You think I'm just some animal?"

"Fighting for what's right never gets easier."

"Justice is worth fighting for."