Who said "The god of death is patient but never forgets."?

This quote is attributed to Arya Stark.

The god of death is patient but never forgets. - Arya Stark

"The god of death is patient but never forgets."

Arya Stark Justice

"A girl has no name."

"The north remembers."

"Not today."

"What do we say to the god of death? Not today."

"Justice must always prevail."

"You think I'm just some animal?"

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

"Justice is worth fighting for."