Who said "The avenger does not stop walking the path of darkness."?

This quote is attributed to Sasuke Uchiha.

The avenger does not stop walking the path of darkness. - Sasuke Uchiha

"The avenger does not stop walking the path of darkness."

Sasuke Uchiha Perseverance

"I am an avenger."

"I don't care about anyone else. I only care about my own power."

"You are my favorite person to fight."

"I'm not interested in anything that doesn't involve becoming stronger."

"Perseverance is the key to success."

"Don't give up on what you believe in."

"I've been through worse."

"You learn to live with the pain."