Who said "I speak for those who cannot speak for themselves."?

This quote is attributed to Missandei.

I speak for those who cannot speak for themselves. - Missandei

"I speak for those who cannot speak for themselves."

Missandei Justice

"I am Missandei of Naath, interpreter and advisor to the Dragon Queen."

"Daenerys Targaryen chose to free us, not because she needed us, but because it was right."

"Knowledge is power, but wisdom is knowing how to use it."

"I have served many masters, but I chose to serve the Mother of Dragons."

"Justice must always prevail."

"You think I'm just some animal?"

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

"Justice is worth fighting for."