This article focuses on the Platonic version of the doctrine of oikeiosis set forth by Piso in Cicero’s De finibus, Book V. The article aims to show that: 1) Cicero’s account, while clearly having Stoic features, is also consistent with the eudaemonistic character of Socrates’ and Plato’s ethics; 2) the replacement of oikeiosis with “assimilation to god”, attested in a passage of the Anonymous Commentary on Plato’s Theaetetus, derives from the intent to remove Epicurean egoistic connotations from Plato’s ethics; according (...) to the Anonymous, the Stoic oikeiosis alone would not suffice to attain this purpose. (shrink)