Who said "I have learned that hope is not weakness."?

This quote is attributed to Grey Worm.

I have learned that hope is not weakness. - Grey Worm

"I have learned that hope is not weakness."

Grey Worm Hope

"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."

"Every day is a new opportunity."

"Hope is what gets us through difficult times."

"I'm not your enemy, kid. I'm trying to save you."

"Redemption is a long road."