Full Idea
It is not possible to discover any other beginning of justice or any source for it other than that from Zeus and from the universal nature.
Gist of Idea
The source of all justice is Zeus and the universal nature
Source
Chrysippus (fragments/reports [c.240 BCE], fr 326), quoted by Plutarch - 70: Stoic Self-contradictions 1035c
Book Reference
Plutarch: 'Moralia - vol 13 part 2', ed/tr. Cherniss,Harold [Harvard Loeb 1993], p.433
A Reaction
If the source is 'universal nature', that could agree with Plato, but if the source is Zeus, then stoicism is a religion rather than a philosophy.