Who said "What we have endured has made us unbreakable."?

This quote is attributed to Grey Worm.

What we have endured has made us unbreakable. - Grey Worm

"What we have endured has made us unbreakable."

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."