Chimera

“When you run with the Doctor, it feels like it'll never end. But however hard you try you can't run forever. Everybody knows that everybody dies and nobody knows it like the Doctor. But I do think that all the skies of all the worlds might just turn dark if he ever for one moment, accepts it. Everybody knows that everybody dies. But not every day. Not today. Some days are special. Some days are so, so blessed. Some days, nobody dies at all. (In the library, the Doctor walks back to the TARDIS. He stops, looking at the doors. Then he raises his hand, and stands there poised like that for a long moment. Finally he snaps his fingers. The doors open. He smiles slowly and walks in, joining Donna. Then he snaps his fingers again, and the doors close. River's voice continues over this.) Now and then, every once in a very long while, every day in a million days, when the wind stands fair, and the Doctor comes to call... everybody lives.”
― Steven Moffat

“The Doctor: Don't blink. Don't even blink. Blink and you're dead. Don't turn your back. Don't look away. And don't blink.”
― Steven Moffat

“River Song: Use the stabilisers!
The Doctor: It doesn't have stabilisers!
River Song: The blue switches!
The Doctor: The blue ones don't do anything, they're just... blue!
River Song: Yes they're blue: they're the blue stabilisers! [presses the button and the TARDIS indeed stabilises] See?
The Doctor: Yeah? Well, it's boring now, isn't it? They're boring-ers! They're blue... boring-ers!
Amy: Doctor, how come she can fly the TARDIS?
The Doctor: You call that flying the TARDIS? [scoffs] Ha!
River Song: Okay, I've mapped the probability vectors, done a foldback on the temporal isometry, charted the ship to its destination and... [presses a button, the cloister bell clangs] parked us right alongside.
The Doctor: Parked us? But we haven't landed!
River Song: Of course we've landed; I just landed her.
The Doctor: But it didn't make the noise.
River Song: What noise?
The Doctor: You know, the... [does an impression of the TARDIS materialisation sound]
River Song: It's not supposed to make that noise. You leave the brakes on.
The Doctor: Yes, well, it's a brilliant noise. I love that noise.”
― Steven Moffat

“The mountains are calling and I must go.”
― John Muir