Full Idea
Philosophy says it is not right even to stretch out a finger without some reason.
Gist of Idea
Even pointing a finger should only be done for a reason
Source
Epictetus (fragments/reports [c.57], 15)
Book Reference
Epictetus: 'The Discourses, The Handbook, Fragments', ed/tr. Gill,C [Everyman 1995], p.313
A Reaction
The key point here is that philosophy concerns action, an idea on which Epictetus is very keen. He rather despise theory. This idea perfectly sums up the concept of the wholly rational life (which no rational person would actually want to live!).