"I always wondered, ever since I took that burden, that curse, I wondered what it could be what -- what my true happiness could even look like. I never found an answer. Because the one thing I want... it's something I know I can't have. But I think I know -- I think I know now. Happiness isn't in the having. It's in just being. It's in just saying it. (...) I know. I know how you see yourself, Dean. You see yourself the same way our enemies see you. You're destructive and you're angry and you're broken. You're -- You're "Daddy's Blunt Instrument." And you think that hate and anger that's -- that's what drives you. That's who you are. It's not. And everyone who knows you sees it. Everything you have ever done, the good and the bad you have done for love. You raised your little brother for love. You fought for this whole world for love. That is who you are. You're the most caring man on Earth. You are the most selfless, loving human being I will ever know. You know, ever since we met, ever since I pulled you out of Hell, knowing you has changed me. Because you cared, I cared. I cared about you. I cared about Sam. I cared about Jack. I cared about the whole world because of you. You changed me, Dean. Because it is. I love you. Goodbye, Dean." Castiel's last words to Dean

Castiel, often shortened to Cass is a powerful angel of the Lord who was responsible for saving Dean Winchester from Hell,on the archangels' command. It was his job to help prevent Lilith from breaking the 66 Seals that, once broken, would release Lucifer from his cage in Hell. Once Castiel learned that the angels wished to free Lucifer anyway, he defied his angelic brethren and died trying to help Dean prevent Sam Winchester from breaking the last seal.

Castiel is now helping Jack the new god to recreate heaven and undo Chuck's damage