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… is from page 173 of Arnold Plant [2]’s 1970 essay “Homage to Hayek” as this essay is reprinted (and retitled) in the 1974 collection of some of Plant’s writings, Selected Economic Essays and Addresses [3]:
Those whose advocacy of social change is powered by strong emotion have often been repelled by the cold-blooded nature of his [Hayek’s] purely intellectual approach. They would do well to reflect that they would not wish a surgeon to operate on them while his hands were trembling with emotion.