[ Only in theory, but he sees she's listening so he'll make it simple. ]

What you'll create isn't sustainable. There's too many chances of creating a paradox that could be more catastrophic than anything you're trying to prevent. Time will move on around you, people will come, and the whole thing will fall apart.

I was one of those people. We're survivors who have closed the gates of Hell to get here. We can beat them back, and if some still die, you can trust that it'll be better than what happens if we don't stop this before it starts.