Full Idea
The rational animal is corrupted, sometimes because of the persuasiveness of external activities and sometimes because of the influence of companions. For the starting points provided by nature are uncorrupted.
Gist of Idea
Rational animals begin uncorrupted, but externals and companions are bad influences
Source
report of Chrysippus (fragments/reports [c.240 BCE]) by Diogenes Laertius - Lives of Eminent Philosophers 07.89
Book Reference
'The Stoics Reader', ed/tr. Inwood,B/Gerson,L.P. [Hackett 2008], p.114
A Reaction
If companions corrupt us, what corrupted the companions? Aren't we all in this together? And where do the 'external activities' originate?