The morality of the heart, as I see it, consists in the main of kindly feelings and good nature. But these cannot be produced by sermons: they are produced by good digestion, sound glands, and fortunate circumstances. “Do your duty, however unpleasant it may be for all concerned” is edifying and appeals to your sadistic instincts.
Source: On being edifying, 1932. In: Mortals and Others; Bertrand Russell's American Essays, 1931-1935, v.1
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