'Any other century', indeed. Sebastian only has the one to compare to, but he'll take Jack's word that humans are humans as only humans can be. (Sometimes, they can be repetitive.)

He might be lying about the end of the universe. He probably is lying, but it's still a heartening thought to know that humanity survives. "After that long, with that much evolution, we're bound to be at least a little different. I don't mind."