Castiel... You know as well as I do, Father does not make mistakes.
He created me, knowing full well what I would become. He made me the way I am for a reason, He wanted this. And He wanted me out of my cage.
I seek the same justice as you, to right the wrong.
[Lucifer gives cas those devilish eyes]
I have never hurt an innocent creature, and I never will. I love our Father more than anything in this world, Castiel. I can help you, no strings attached.
[Lucifer steps just a little closer, whispering now, almost comfortingly] I know how you feel, I know the pain. I can help you, Dean Winchester was wrong. He didn't believe you, he didn't trust you, he didn't even give you a chance to explain before he beat you down. You poor creature, my heart weeps for you.