Who said "The world is harsh. We must be harsher still."?

This quote is attributed to Brienne.

The world is harsh. We must be harsher still. - Brienne

"The world is harsh. We must be harsher still."

Brienne Strength

"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."

"Strength comes from within."

"A woman should be proud of who she is."

"A strong woman can overcome anything."

"The only thing I'm good at is killing."