Hume, Plato, and the Impotence of Reason
Hume infers from his insight that it is not reason but moral opinion that moves us to act, that reason is not the source of moral opinion. From this, he then further argues that moral opinion is a product of the passions – special emotions that arise out of the relations of ideas and impressions. In this essay, I will argue that Hume’s initial inference is correct, but that his subsequent inference is not. Passions may indeed arise from relations of ideas and impressions, but there is no good reason to presume passions, though necessary, are sufficient to produce a moral opinion.