Who said "To speak many tongues is to hold many keys."?

This quote is attributed to Missandei.

To speak many tongues is to hold many keys. - Missandei

"To speak many tongues is to hold many keys."

Missandei Knowledge

"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."

"We're not just after treasure. We're preserving history."

"The mind is humanity's greatest tool."

"A tidy room reflects a tidy mind."

"You can learn a lot about a person by how they keep their space."