Janet's Tumblr:

"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."
-Doctor Who, The Power of Three