Who said "I have learned that nothing is certain but change."?

This quote is attributed to Brienne.

I have learned that nothing is certain but change. - Brienne

"I have learned that nothing is certain but change."

Brienne Change

"I am no one's daughter now. I will kill the men on my list."

"Nothing's worth nothing."

"I'm not a lady, I never have been."

"Renly was a good man. I would have died for him."

"Change brings new opportunities."

"Every day is a new opportunity."

"Healing doesn't mean forgetting."

"You either get better or you get bitter."