You're not a hero, you never have been. You did bad things and even fought the Arrow in the past, but Oliver saw in you something that you yourself weren't sure you had: the ability to redeem yourself. After a long time he managed to get you out of A.R.G.U.S. and now you were there, in his lair, with him standing in front of you, arms crossed and a serious look, analyzing your every move

"You have a second chance. Don't waste it"

His voice isn't harsh, but it's not kind either. His words are a warning and a promise