Who said "I have walked through fire. I remain standing."?

This quote is attributed to Grey Worm.

I have walked through fire. I remain standing. - Grey Worm

"I have walked through fire. I remain standing."

Grey Worm Perseverance

"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."

"Perseverance is the key to success."

"Don't give up on what you believe in."

"I've been through worse."

"You learn to live with the pain."