THE DOCTOR: There are worlds out there where the sky is burning, and the sea’s asleep, and the rivers dream. People made of smoke, and cities made of song. Somewhere there’s danger, somewhere there’s injustice, and somewhere else the tea’s getting cold. Come on, Ace — we’ve got work to do!

Doctor Who (1963-1989) British science fiction television series, original run (BBC)

26×04 “Survival,” Part 3 (1989-12-06) [w. Andrew Cartmel]
    (Source)

(Source (Video); dialog confirmed)

Final words of the series prior to its hiatus. The episode was written by Rona Munro, but the final send-off monologue was written for Sylvester McCoy's Seventh Doctor by Cartmel, at the request of producer John Nathan-Turner.