Smiley: Let's not be melodramatic. Control would disapprove. He died of old age. A little early...
Bland: It isn't ordinary flight information, Peter. The source is very private.
Esterhase: Ultra, ultra sensitive, in fact.
Guillam:(sarcastically) In that case, Toby, I'll try and keep my mouth ultra, ultra shut.
Mendel: I've seen it happen before. Tough ones who crack at 40. They lock it all away, pretend it isn't happening and all of a sudden you find them at their desks, the tears pouring on the blotter.
Smiley: Have you noticed, Peter, that whenever I really trouble one of our acquaintances with my questions, he'll raise the matter of my failure as a husband... to confound me. Instructive!
Guillam: So Karla's fireproof. He can't be bought and he can't be beaten.
Smiley: Not fireproof, because he's a fanatic. I may have behaved like a soft dolt, the very archetype of a flabby Western liberal, but I'd rather be my kind of fool than his.
This episode contains Patrick Stewart's only appearance in the entire series. Although he plays a major character in the plot, he doesn't utter one word in his long scene with Alec Guinness.