“…On the historical side, the most important upshot is that Hume's foundational moral theory turns out to have been answered in his own lifetime by a powerful and accurate philosophical interlocutor, one who both understood and accurately engaged Hume's positions, not just piecemeal but systematically and in the round. Although Hume's moral theory was subsequently subjected to attack by James Balfour (1753) and James Beattie (1770), as well as (somewhat) less splenetically by Thomas Reid (1783), their engagements do not address the true nature of Hume's arguments, but concentrate fire on caricatures and misreadings, generating little of philosophical substance. Smith, by contrast, understood Hume's theory very precisely, and constructed a response that was a serious and profound challenge to its viability.…”