Dr who eleventh doctor quotes cold blood

The Doctor: Keep him in your mind. If you forget him you'll lose him forever.
Amy: Back at the Byzantium, I still remember the clerics, because I'm a time traveller now, you said —
The Doctor: No they weren't part of your world, this is different, this is your own history changing!
Amy: Tell me it's going to be okay, you have to make it okay!
The Doctor: It's going be hard but you can do it, Amy! Tell me about Rory, eh? Fantastic Rory! Funny Rory! Gorgeous Rory! Amy listen to me, do exactly as I say. Amy please keep concentrating! You can do this!
Amy: I can't!
The Doctor: You can, you can do it. I can't help you unless you do it, come on. You can still save his memory, come on Amy! Please come on Amy, come on. Amy please. Don't let anything distract you! Remember Rory, keep remembering. Rory's only alive in your memory. You must keep hold of him. Don't let anything distract you. Rory still lives in your mind.

Amy:Sorry, what were you saying?

The Doctor: There are fixed points throughout time where things must stay exactly the way they are. This is not one of them, this is an oppurtunity. Whatever happens here will create its own timeline, its own reality, a temporal tipping point. The future revolves around you, here, now, so do good!