Chapter 2 discusses fragments surviving from Iamblichus’ correspondence. This correspondence, which includes open letters destined for a wider readership, seems to have been collected for use in the philosophical schools. The collection contains letters which originally, I argue, were of different types. One type is that of an exhortation (a ‘protreptic’) to the study of a science, in this case dialectic. I compare this protreptic with that to be found in Iamblichus’ De communi mathematica scientia; both protreptics correspond to the rhetorical model for the praise of a science. Another type of open letter is that which proposes a ‘Mirror of Princes’ for the edification of people in power and their entourage. A third type to be found in the letters is a monograph which discusses a difficult philosophical question: the relation between fate and freedom. If addressed to a well-educated professional, perhaps a former student of Iamblichus, this letter could have had a wider circulation.