Confused, Dean presses what Castiel means by this, Castiel shows Dean the shadows of his wings and telling him that God has work for Dean to do. 4.02 Are You There, God? Its Me, Dean Winchester. Castiel appears to Dean in a dream set in Bobbys kitchen, and confirms that the spirits who attacked them were Witnesses. He tells Dean that Lilith summoned them, and that in so doing she broke one of the 66 Seals. He explains that the angels are fighting to keep the other seals intact, because when the last one is broken, Lucifer will be freed.