Who said "Death is certain. What we do before it is what matters."?

This quote is attributed to Brienne of Tarth.

Death is certain. What we do before it is what matters. - Brienne of Tarth

"Death is certain. What we do before it is what matters."

Brienne of Tarth Death

"I am no one's daughter now. I am Brienne of Tarth, and I will answer to no man but the Lord of Light."

"The things we love destroy us. Every time."

"I'm not a lady. I'm a warrior."

"Oaths are not words. They are things we do."

"Death doesn't scare me anymore."

"Death and I are old friends."

"Welcome to my world."

"Death is just the beginning."