The Doctor: The end of your life is already begun. There is a last place you will ever go, a last door you will ever walk through, a last sight you will ever see. And every step you ever take is moving you closer. The end of the world is a billion, billion tiny moments. And somewhere, unnoticed, in silence or in darkness, it has already begun.
Bill [outside the TARDIS]: ...Are you talking to yourself in there?