“Such a principled disregard of ad hominem evidence is a characteristically modern prejudice of professional philosophers. For most Greek and Roman thinkers from Plato to Augustine, theorizing was but one mode of living life philosophically. To Socrates and the countless classical philosophers who tried to follow in his footsteps, the primary point was not to ratify a certain set of propositions (even when the ability to define terms and analyze arguments was a constitutive component of a school's teaching), but rather to explore 'the kind of person, the sort of self' that one could elaborate as a result of taking the quest for wisdom seriously.”