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I think Zizek wrote something similar to this somewhere (perhaps in a Guardian article): "When philosophers, who are well known to have difficulty in keeping silent, engage in conversation, they should try always to lose the argument, but in such a way as to convict their opponent of untruth. The point should not be to have absolutely correct, irrefutable, watertight cognitions--for they inevitably boil down to tautologies, but insights which cause the question of their justness to judge itself." (Adorno. Minima Moralia. 70-71)