…Ostrakova had already sworn to herself that she would restrain both her quick temper and her quick tongue, and she now physically enjoined herself to this vow by grabbing a piece of skin on the soft inside of her wrist and inching it through her sleeve with a fierce, sustained pressure under the table, exactly as she had done a hundred times before, in the old days, when such questionings were part of her daily life—When did you last hear from your husband, Ostrakov, the traitor? Name all persons with whom you have associated in the last three months! With bitter experience she had learned the other lessons of interrogation too. A part of her was rehearsing them at this minute, and though they belonged, in terms of history, to a full generation earlier, they appeared to her now as bright as yesterday and as vital: never to match rudeness with rudeness, never to be provoked, never to score, never to be witty or superior or intellectual, never to be deflected by fury, or despair, or the surge of sudden hope that an occasional question might arouse. To match dullness with dullness and routine with routine. [My emphasis]
— From Smiley’s People, by John le Carré