X-Men: Days of Future Past2014

Kitty Pryde:
You want to go back there?

Professor X:
If I can get to her, stop the assassination, keep her out of their hands, then we can stop the Sentinels from ever being born.

Magneto:
...and end this war before it ever begins.

Kitty Pryde:
I can send someone back a couple of weeks, maybe a month, but you're talking about going back decades. You have the most powerful brain in the world, Professor but the mind can only stretch so far before it snaps. It would rip you apart, I'm sorry. No one could survive that trip.

Wolverine:
What if someone's mind has a way of snapping back? What if someone can heal as fast as it ripped apart?