Barrie Fleet is affiliated Lecturer and former Fellow and Director of Studies in Classics at Corpus Christi College, University of Cambridge, UK. He is the author of Plotinus: Ennead III.6 On the Impassivity of the Bodiless. Text with a Translation and Commentary (Oxford, 1995), and three volumes in the Ancient Commentators on Aristotle series edited by Richard Sorabji (Cornell/Duckworth): Simplicius: On Aristotle Physics 2 (1997), Simplicius: On Aristotle Categories 5 & 6, with Frans de Haas, (2001), and Simplicius: On Aristotle Categories 7 & 8 (2002). He also made a substantial contribution to The Philosophy of the Commentators, 200-600 AD: A Sourcebook (ed. Richard Sorabji, Duckworth 2004).

Plotinus was much exercised by Plato's doctrines of the soul. In this treatise, at chapter 1 line 27, he talks of "e;the divine Plato, who has said in many places in his works many noble things about the soul and its arrival here, so that we can hope for some clarity from him. So what does the philosopher say? It is clear that he does not always speak with sufficient consistency for us to make out his intentions with any ease."e; The issue in this treatise is one that has puzzled students of Plato from ancient to modern times-and is indeed a popular topic for undergraduate essays even today: Why should the philosopher, who has ascended through a long and painful process of dialectic to "e;assimilation to the divine,"e; ever descend back into the body? Plotinus himself is said by Porphyry to have attained such a state of other-worldly transcendence on at least four occasions during his lifetime, so this was a very real and personal issue for him. In this treatise we see him grappling with it.