"Yes. I have to kill my grandfather and save the world. He's almost done destroying everything, we have one more chance. I'm the only one who is powerful enough to do it." Jack sounds very sure of himself, which is rare, as he's often questioning himself and everything surrounding him. But in this he is certain. This is his purpose. There had to be a reason for him to exist, because he shouldn't have, but now it all makes sense. No one else could match God in power but his own grandson.

"I've already died, he killed me the last time. I was brought back solely for this reason, to get stronger and stop him." So he and God have a bit of a back and forth already. Chuck saw him for the threat he was but at the time Jack wasn't powerful enough fully to go up against him. It was very easy for Chuck to take him out then. Jack's twice as strong now, although he still lacks that killer spirit that makes him as dangerous as he could be. (Luckily for Jack, he finds a non-lethal way of ending it, which is very him, but he doesn't know.)

"It wasn't so bad, being dead. The afterlife for us isn't like Hell, it's basically eternal nothingness. No pain or misery, just the Empty." It is, in fact, a terrible afterlife. Endless emptiness, some say it's worse than Hell. Jack looks wistful for a moment. "I did get to go to Heaven once and meet my mother, which was nice, but the ruler of the Empty insisted I belonged there." He liked Heaven, although it wasn't as perfect as people said it was. But meeting his mother was everything to him. He can die happy knowing she's happy.

He says all of this very calmly and earnestly. It's the sort of acceptance of someone who has already passed all the stages of grief, or never bothered to have them at all. "These three years with my family were better than nothing. I'm okay with it."