Who said "To serve a just cause is to find meaning."?

This quote is attributed to Grey Worm.

To serve a just cause is to find meaning. - Grey Worm

"To serve a just cause is to find meaning."

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."