User blog comment:NaiflidG/Discussion on Cain (possible spoilers)/@comment-3045936-20131222212107

Maybe Cain was the first human to be condemed to Hell for his actions. As Lilith was created by Lucifer from a girl as a mockery of God's beloved creations. So Cain would be the purest in the sense as the original first human sinner turned into a demon. As Henry said the Knights of Hell are hand picked by Lucifer himself, among them are the first fallen.