Amy and The Doctor in “The Power of Three”

Well, there was a time -- there were years when I couldn't live without you, um... When just the whole "everyday" thing would drive me crazy... But since you've dropped us back here, since you've given us this house, y'know, we've built a life! I-- I don't know if I can have both.

Why?

Because they pull at each other. Because they pull at me, and because the traveling is starting to feel like running away.

That's not what it is.

Oh, c'mon, look at you. Four days in a lounge and you go crazy.

I'm not running away. But this is one corner of one country in one continent on one planet that's a corner of a galaxy that's a corner of a universe that is forever growing and shrinking and creating and destroying and never remaining the same for a single millisecond, and there is so much, so much, to see, Amy, because it goes so fast. I'm not running away from things, I am running to them before they flare and fade forever. And it's alright. Our lives won't run the same. They can't. One day, soon maybe, you'll stop. I've known for a while.

Then why do you keep coming back for us?

Because you were the first. The first face this face saw. And you're seared onto my hearts, Amelia Pond. You always will be. I'm running to you and Rory before you fade from me.