"So now we have three models of the mind. Plato said that reason ought to be the master, even if philosophers are the only ones who can reach a high level of mastery. Hume said that reason is and ought to be the servant of the passions. And Jefferson gives us a third option, in which reason and sentiment are (and ought to be) independent co-rulers, like the emperors of Rome, who divided the empire into eastern and western halves. Who is right?"