Cain quotes from Supernatural

Cain

You're holding back! What is it Dean? You think if you hold back just enough you won't succumb? That you'll leave this fight the same as you entered? Look to my example boy! There is no resisting the Mark or the Blade, there is only remission and relapse!

Crowley

Ah, that's, uh, a funny story, really. Bit of a misunderstanding. We really should --

Cain

[motions with his hand and Crowley is rendered speechless] Shh.

Dean

Oh, you gotta teach me how to do that.

Cain

I can give you the mark, Dean, if it's what you truly want.

Dean

What are you talking about?

Cain

The mark can be transferred to someone who's worthy.

Dean

You mean a killer like you?

Cain

Yes.

Dean

Can I use it to kill that bitch?

Cain

Yes. But you have to know with the mark comes a great burden. Some would call it a great cost.

Castiel

This is a massacre.

Cain

Yes. And soon it will be a genocide. My children, my whole poisoned issue. Lot of them out there right now... killers, fighters, thieves. Some more peaceful than others, but they still carry it... the disease. If the Mark wants blood, I'll give it mine.

Castiel

You are Adam and Eve's first born, your descendants are legion.

Cain

At most I'm culling... one in ten.

Castiel

Of everyone.

Cain

I've got time.

Cain

It's been too long. That old feeling, makes me wonder how I ever had the strength to resist... This may be hard to believe, what I'm about to do to you, but I care about you Dean, I truly do, but I know I'm doing you a favor. I'm saving you.

Dean

Saving me from what?

Cain

From your fate. Has it ever occurred to you? Have you never mused upon the fact that you are living my life in reverse. My story began when I killed my brother, and that's where your story will inevitably end.

Dean

No. Never.

Cain

It's called the Mark of Cain for a reason! First, first you'd kill Crowley... there'd be some strange mixed feelings on that one, but you'd have your reason, get it done, no remorse. And then you'd kill the angel Castiel, now that one, that I suspect would hurt something awful. And then... Then would come the murder you'd never survive, the one that would finally turn you into as a much of a savage as it did me... your brother Sam. The only thing standing between you and that destiny is this blade. You're welcome my son.