Abstract

One of the great achievements of Pierre Hadot has been to chart how philosophy's self‐conception has shifted over time, first as the culture of the classical world gave way to that of medieval Christianity, and then again through the long and gradual emergence of the modern age. Hadot himself suggests that the crucial shift came in the middle ages, as a result of the growing dominance of Christianity. The chapter argues that philosophy in both its classical and medieval incarnations has consistently involved systematic logical inquiry of an abstract. Descartes’ philosophy is Janus‐faced, affording us frequent glances back to the tradition he grew out of, but also allowing glimpses forward to the modern age that his ideas helped to launch.