According to the second narrative, one version of which we shall develop in this chapter, Arcesilaus’ successors were right to modify and mitigate his originally radical scepticism. In particular they were right to limit the scope of what we must suspend judgement about, and to enlarge the scope of sceptically appropriate assent. Viewed in this way, their concessions constitute progress: the culmination of many years of philosophical debate with the Stoics.