John: By the time Skynet became self-aware it had spread into millions of computer servers across the planet. Ordinary computers in office buildings, dorm rooms; everywhere. It was software; in cyberspace. There was no system core; it could not be shutdown. The attack began at 6:18 PM, just as he said it would. Judgment Day, the day the human race was almost destroyed by the weapons they’d built to protect themselves. I should have realized it was never our destiny to stop Judgment Day, it was merely to survive it, together. The Terminator knew; he tried to tell us, but I didn’t want to hear it. Maybe the future has been written. I don’t know; all I know is what the Terminator taught me; never stop fighting. And I never will. The battle has just begun.
Terminator: It was Katherine Brewster who reprogrammed me and sent me back through the time displacement field.
John Connor: Why didn’t I send you back?
Terminator: I’m not authorized to answer your questions.
Kate Brewster: Why didn’t he send you back?
Terminator: He was dead.
John Connor: Oh, well that sucks.
Kate Connor (Bryce Dallas Howard), Terminator: Salvation
Dr. Silberman (Earl Boen) ruminates on past experiences with Kate Brewster (Claire Danes), Terminator 3: Rise of the Machines