Full Idea
Cleanthes says there are six parts: dialectic, rhetoric, ethics, politics, physics, and theology.
Gist of Idea
Six parts: dialectic, rhetoric, ethics, politics, physics, theology
Source
report of Cleanthes (fragments/reports [c.270 BCE]) by Diogenes Laertius - Lives of Eminent Philosophers 07.41
Book Reference
'The Stoics Reader', ed/tr. Inwood,B/Gerson,L.P. [Hackett 2008], p.8
A Reaction
This was a minority view, as most stoics agreed with Zeno and Chrysippus that there are three main topics. Nowadays there is little discussion of the 'parts' of philosophy, but the recent revival of meta-philosophy should encourage it.