Who said "I've learned that revenge is a hollow victory."?

This quote is attributed to Arrow.

I've learned that revenge is a hollow victory. - Arrow

"I've learned that revenge is a hollow victory."

Arrow Justice

"My name is Oliver Queen. After five years in hell, I have come home with only one goal: to save my city."

"I'm not the man I was."

"You have failed this city."

"I'm a monster."

"Justice must always prevail."

"You think I'm just some animal?"

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

"Justice is worth fighting for."