The following Doctor Who quote comes from the episode Gridlock, originally airing on April 14, 2007.
The Face of Boe: Everything has its time. You know that, old friend, better than most.
Hame: The legend says more.
The Doctor: Don’t, there’s no need for that.
Hame: It says that the Face of Boe will speak his final secret to a traveler.
The Doctor: Yeah, but not yet; who needs secrets, eh?
The Face of Boe: I have seen so much, perhaps too much. I am the last of my kind, as you are the last of yours, Doctor.
The Doctor: That’s why we have to survive, both of us. Don’t go.
The Face of Boe: I must, but know this, Time Lord: You are not alone.