Quoted in this review:
Both Horkheimer and Adorno recognize that there is something sinister in the undiluted hostility to argument in certain twentieth-century philosophers. "Thinking that renounces argument -- Heidegger -- switches into pure irrationalism," Adorno cautions; "the mistrust of argument is at bottom what has inspired the Husserls and the Heideggers. The diabolical aspect of it is that the abolition of argument means that their writing ends up in tautology and nonsense." (72)
As the review goes on to note, Adorno's own attitude towards philosophical argument was far more ambivalent than this (justified) jab at Heidegger would suggest.
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