Who said "Justice without strength is merely a pretty word."?

This quote is attributed to Drogon.

Justice without strength is merely a pretty word. - Drogon

"Justice without strength is merely a pretty word."

Drogon Justice

"I am fire. I am death."

"Dracarys."

"A dragon is not a slave."

"I will burn them all."

"Justice must always prevail."

"You think I'm just some animal?"

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

"Justice is worth fighting for."