Travel to the annual convention of the Society for Classical Studies (aka APA) held in New Orleans, LA Jan 8-11, 2015 to give a paper entitled "Dialectic as autopsia: a lesson in Neoplatonic rationality" as part of a panel on The Greeks and the Irrational. In the paper, I discuss a fragment from Damascius' Philosophical history which captures a unique teaching moment from Late Antiquity (5AD). The philosopher Isidore triggered a life-changing transformation in the mind of the obscure Dorus from Arabia, who was a learned Aristotelian. Isidore revealed to him aspects of dialectic, which were until then unknown to Dorus. I will argue that despite the fact that Neoplatonism since the work of Dodds (The Greeks and the Irrational) had become heavily associated with the ‘irrational', late antique Neoplatonist philosophers themselves viewed their teaching activity as the pinnacle of rationality both in content and approach. The term describing Isidore's teaching of dialectic in this fragment is autopsia, a scientific term for disinterested objectivity that researchers since Herodotus had used to distinguish their empirical and data-based methodology from hearsay and myth.