Full Idea
Chrysippus has often written on the theme that there is nothing reprehensible or blameworthy in the universe since all things are accomplished in conformity with the best nature.
Gist of Idea
Chrysippus says nothing is blameworthy, as everything conforms with the best nature
Source
report of Chrysippus (fragments/reports [c.240 BCE]) by Plutarch - 70: Stoic Self-contradictions 1051b
Book Reference
Plutarch: 'Moralia - vol 13 part 2', ed/tr. Cherniss,Harold [Harvard Loeb 1993], p.557
A Reaction
This is Leibniz's "best of all possible worlds", but deriving the idea from the rightness of nature rather than the perfection of God. Chrysippus has a more plausible ground than Leibniz, as for him nasty things follow from conscious choice.