Stoic physics is pantheist and materialist at once: there is one substance, it is alive, and reason is its organising tension rather than something added to it. From that follows the doctrine of fate — everything is caused, including your assent — and the claim that virtue is agreement with the way things are going. Marked as held by most rather than shared because the later Roman Stoics get thinner about it: Marcus repeatedly writes "gods or atoms" and concludes that either way the ethical instruction is the same. That hedge is the crack the modern movement widened.